math/sc-im: Update to 0.8.3

Changes:

New
- Multi Sheet support
  added :newsheet, :nextsheet, :prevsheet :delsheet COMMAND_MODE
  commands. `gt` and `gT` commands in NORMAL_MODE are now used for
  moving between sheets
  - added new colors types SHEET, CURRENT_SHEET and FILENM
  - .sc file saving with multiple sheets
  - loading xlsx with multiple sheet
  - saving xlsx with multiple sheets
  - add :renamesheet COMMAND_MODE command
  - created movetosheet command in gram.y, to be used internally or in
    scripts when saving and loading files.
  - reeval in multiple sheets: graph now should keep track of the
    different sheets reference cells from different sheets in formulas:
    ={"Sheet2"}!A2
- Save triggers in files
- Added automated tests
- C command in EDIT MODE
- Added ignore_hidden configuration variable to address #674 #653. With
  this hidden rows can be ignored when exporting spreasheets. Useful
  when exporting the result of a filter. This will also be honored
  when copy/pasting a range that have hidden rows in it.
- PR 725: added 'default_open_file_under_cursor_cmd' configuration
  value that can be set at runtime

Changes
- added more detailed error in gram.y:yyerror
- Adapt string and number search for multisheet
- marks now considers sheet. We could have mark A in Sheet 1, and
  mark B on Sheet 2.
- modified tick() and fix_marks()
- Renamed auto_justify to auto_fit
- `gt` command of NORMAL_MODE renamed to `go`
- Removed --sheet and --filename_with_mode configuration variables
- UNDO now saves reference to the sheet where the action took place.
- copy_to_undostruct() now keep in added/removed list struct ent_ptr *
  (that knows of sheets), rather than struct ent *.
- Copy alignment of strings when doing `Pf`.
- undo: save maxrow, maxcol, modflg values before and after changes,
  so they can be restored after undo/redo actions
- Modified yanklist to be struct ent_ptr list, rather than struct ent
  list.
- Ents_that_depends_on_list now takes ent_ptr rather than struct ent *
  as parameter
- Backslash double quotes in cpaste. Issue 574.
- Do not free ents of sheets when deleting a sheet manually (only at
  exit).  just mark them as deleted.
- Inform old value and new value when changing configuration variable
- UI optimizations
- Store offscr_sc values when saving sc files. Restore them when
  loading sc files
- Simplify clipboard code
- xlsx.c: Convert to uppercase before replacing functions
- Added D command on EDIT mode.
- ESC in EDIT_MODE also confirm changes.
- Reeval when pasting from clipboard and autocalc is set
- Adjust Makefile to have logic for clipboard commands on MacOS

Fixes
- fixed building warnings
- fix in calc_mobile_cols()
- fix not updating graph correctly after yanking cells with references
  -> Pc -> undo.  It could also segfault on ocassions as well. Added
  test5 and test6 for this.
- Issue #568: handle '>' and '<' on mappings.
- Issue #569: fix invalid read/write/segfault when deleting column.
  Added test8 and test9 for this.
- fix horizontal scroll when editing cells with long strings (wider
  than screen)
- Avoid reading passed maxcols maxrows when shifting left or up over
  last sheet column/row.
- fix in Pv when pasting over same place where data was yanked.
- fix in paste_yanked_ents: calloc didnt count that yanked cells could
  share dependencies.
- fix a bug when refreshing grid when autowrap operates. Issue 578.
- Avoid segfault in autobackup when no current file is set.
- fix in cw dw c$ d$ commands of EDIT_MODE
- fix leak in del_selected_cells
- fix when using C-r in INSERT_MODE
- fix arguments reversed on sc.colrow2a
- fix in delete_filters that caused SEGFAULT. Issue 637.
- fix in unformat. call to copy_to_undostruct with wrong parameters.
- fix swapped arguments on lsetform
- added string functions to dep graph
- Issue #697: do not allow to override nocurses config variable
- fix #694: csv import and export / LaTex export
- fix #700: '{' '}' normal mode commands reset cmd_multiplier

(sjmulder)