Update to 0.9.2

Changelog:
2011-09-27 Release 0.9.2:
    * Score Checking
          o Performed automatically before printing (optional)
          o Under/Overfull measures
          o Unterminated tuplets
          o Miss-matched slurs.
    * Pitch Spelling
          o Performed live on MIDI entry
          o Colors intervals that may be enharmonic spelling mistakes with a di
fferent timbre
    * Enter Accidental before or after note
          o Use enter accidental to avoid sounding spurious notes on entry.
          o Change a note to one of its enharmonic variants. Same absolute pitc
h (in Equal Temperament).
          o Change the duration of single notes in a chord to create single-voi
ce polyphony
    * Vertical Rest Positioning (for polyphony)
    * Grace Notes that come after rather than before the main note.
    * Improved display of under/overfull measures
    * Display shows if there are measures before/after those on screen and provi
des buttons to navigate
    * Better beaming control.
    * Arbitrary Dynamics text.
    * New Denemo fonts
          o Denemo's own font now uses standard unicode font symbols
          o LilyPond font accessible to scripts
          o Improved display of entered music, help texts etc.
          o Simpler scripting to display any LilyPond feature.
    * Thumbnails for .denemo files in file open dialog and for your Window Manager
          o Thumbnail shows a selection of your choice as finally typeset.
          o Default thumbnail is first three measures
    * Import images of scores for transcription
          o Scores captured bar-by-bar into Denemo, displayed directly underneath the bar they relate to.
          o Editorial decisions/errors can easily be checked
          But Linux only.
    * Bug Fixes
          o Vertical scrolling (a long-standing bug fixed at last)
          o Bookmark searching
          o Nested tuplet display
          o Redo crashes
    * Notes:
          o As yet no windows binary is available
          o Playback out of priority thread is not in this release.
          o The manual does not have the latest list of scheme commands available.

(ryoon)