Log Message:
Update to 0.4.0:

Diffuse 0.4.0 - 2009-08-17
- changed the default hotkeys for merging to reflect the direction text \ 
"moves"
- added format menu with new items for changing case, sorting, and manipulating \ 
white space
- replaced 'Hide end of line characters' preference with 'Show white space \ 
characters'
- errors are now reported in a dialogue instead of printing to stderr
- optimised redraws when only the cursor position has changed
- input methods that use pre-editing can now be used when editing text
- dead keys can now be used when editing text
- updated Monotone support to use 'mtn automate inventory'
- Git support now handles files flagged as 'unmerged'
- graceful handling of and non-zero exit codes from 'git status'
- added version control section to the manual
- minor bug fixes