Update to 0.17

Changelog:
tig-0.17
--------

Improvements:

 - Start rewrite of the revision graph renderer. Three modes are
   supported UTF-8, ncurses line graphics, and ASCII. Also, enable
   revision graph rendering by default.

Bug fixes:

 - Fix ncurses 2.8 issue by passing non-zero column size to newwin(1).
 - Fix opening of diffs when browsing branches.

tig-0.16.2
----------

Bug fixes:

 - Fix regression causing empty tree view.
 - Fix set_tabsize() compile error for older versions of ncurses.

tig-0.16.1
----------

Improvements:

 - Add scroll-first-col action to jump to the first column. Bound to '|'
   by default.
 - Add 'status-untracked-dirs' option to ignore unknown directories
   contents in the status view. On by default.

Bug fixes:

 - Fix 'tig show <commit>' to show the provided commit.
 - Fix problem with empty diff views when file specs were passed on the
   command line.
 - Fix segfault when starting tig in pager mode.

tig-0.16
--------

Incompatibilities:

 - Encode everything internally as UTF-8. This can affect performance,
   but should in general improve handling of character lengths etc.
   Also, to properly handle UTF-8 environments use ncurses with wide
   character support.
 - The use of TIG_{MAIN,DIFF,LOG,TREE,BLOB}_CMD environment variables
   has been deprecated. To allow configuration of the diff view,
   TIG_DIFF_OPTS can be used.

Improvements:

 - Plug several memory leaks.
 - Command line arguments are split into diff, revision, and file
   arguments and made available as %(diffargs), %(revargs), and
   %(fileargs). Diff view will limit diffs using %(fileargs).
 - Status view: update the file variable when a line is selected so
   %(file) works as expected.
 - Branch view: add %(branch) symbol providing access to the selected
   branch.
 - Branch view: add entry to browse all branches (uses git-log's --all
   flag).
 - Abbreviation of author names can now be configured and toggled.
 - Mark detached heads with [HEAD].
 - Add support for displaying dates in local time.

Bug fixes:

 - Status view: fix usage from sub directories, which was broken by the
   changes made to support blame view from sub directories.
 - Fix text expansion to not truncate long lines
 - Fix parsing of boolean show-date values.
 - Fix relative date.
 - Fix unbind to behave as if the keybinding was never defined.
 - Fix unbind to also cover built-in run requests.
 - Fix parsing of unknown keymap names.
 - Blame view: fix parent blame to detect renames. It uses "previous"
   line info from the blame porcelain output added in git version 1.6.3.

tig-0.15
--------

Incompatibilities:

 - Setting the cursor color no longer automatically sets the text to
   bold. The old 'lazy' behavior was a bug.
 - Remove check for git-repo-config, which was officially deprecated in
   git version 1.5.4. The configure script no longer depends on git
   being installed.

Improvements:

 - Provide the manual as a man page named tigmanual(7).
 - Add ability to toggle between showing shorter dates (without time
   info) and relative dates. Use 'D' to toggle between date formats.
 - Show the active (instead of the default) keybindings in the help
   view. Furthermore, honor the keymap when suggesting actions in the
   help messages.
 - Add branch view for choosing which branch to display in the main
   view. Bound to 'H' by default.
 - Tree view: show entry to parent directory ('..') when running from
   subdirectory.
 - Tree view: sort entries by name, date or author. Toggling is bound to
   'i' by default, with 'I' controlling whether or not to sort in
   ascending order.
 - Make height of the lower view in a split view configurable by setting
   the 'split-view-height' variable to a number or a percentage.
   Defaults to 2/3 of the total view height.
 - Allow multiple text attributes for color commands:

	color cursor white blue underline bold

Bug fixes:

 - Blame view: fix loading of blame data when opened from the tree view
   and CWD is not the repo root. (Debian bug 540766)
 - Tree view: fix searching.

tig-0.14.1
----------

Improvements:

 - Status view: improve "on branch" information inspired by the prompt
   code in git's bash completion script.
 - Colors for 256-capable terminals can be specified as colorN.
 - Entering a number in the prompt will jump to that line number.
 - Handle core.worktree by setting GIT_DIR and GIT_WORK_TREE.
 - Make behavior of horizontal scrolling configurable by setting the
   'horizontal-scroll' variable to a number or a percentage. Defaults to
   scrolling 50% of the view width.

Bug fixes:

 - Status view: show error when failing to open a file.
 - Status view: report failures to update a file.
 - Blame view: fix problem with uninitialized variable.
 - Blame view: use line number information when loading blame for
   specific commit.
 - Fix handling of quoted strings in the config file.
 - Fix horizontal scrolling glitches.

tig-0.14
--------

Incompatibilities:

 - The screen-resize action has been deprecated. It had no real use for
   users and was never meant to be exposed.
 - The "tree-parent" action was renamed to "parent". Warnings will be
   emitted for transition.
 - Remove parsing of deprecated option -S and subcommands log and diff.
 - The "author" color replaces "main-author". Setting the latter will
   now set the "author" color.

Improvements:

 - Horizontal scrolling. Bound to Left/Right by default.
 - Read tigrc(5) options from git configuration files using the syntax:

	[tig] show-rev-graph = true
	[tig "color"] cursor = yellow red bold
	[tig "bind"] generic = P parent

 - Tree view: avoid flickering when updating.
 - Tree view: annotate entries with commit information.
 - Tree & blob view: open any blob in an editor.
 - Stage & main view: restore view position when reloading.
 - Blame view: load blame for parent commit. For merge commits the parent
   is queried. Bound to ',' by default via the existing "parent" action.
 - Abbreviate author names to initials when the width of the author column
   is below 6 characters.

Bug fixes:

 - Tree view: fix memory corruption bug when updating.
 - Tree view: improve handling of empty trees.
 - Status view: fix reverting of unmerged files.
 - Fix regression for non-UTF-8 locales corrupting the view data.
 - Fix regression parsing multiple spaces in ~/.tigrc.

tig-0.13
--------

Incompatibilities:

 - Commands from the environment (e.g. TIG_MAIN_CMD) will no longer have
   access to shell features, such as subshells and variable expansion.
   The easiest way to upgrade your configuration is to put such commands
   in a script file or as a git alias.

Improvements:

 - Display repository references in the sorted order: tags, heads,
   tracked remotes, remotes.
 - Add bash completion for blame.
 - Tree view: edit files of the current branch.
 - Run requests: new identifiers %(directory), %(file), and %(ref)
 - Improve responsiveness and view loading speed by using select(2).

Bug fixes:

 - Separate blame revision and file argument by "--" to avoid problems.
 - Main view: fix redrawing of the last commit wrt. the revision graph.
 - Fix waiting for input after executing a run request in pager mode.
 - Status & stage view: refuse to open directories and deleted files.
 - Tree view: show error when requesting blame for all non-file entries.
 - Do not draw loading views, which are not displayed.
 - Fix launching of mergetool from a subdirectory.


(ryoon)