[SVN] r5537

[Chris Thomas]

• There's now a visible diff button, as a first step toward status window convergence. Double-clicking continues to invoke diff as well. The UI is subject to change. Feedback welcome.

• Robust subtask launching. Right now, this means that diff failures will be described immediately in an alert rather than failing more-or-less silently. In the future, this will help avoid bogus status updates for failed Add/Remove commands.

• Be less sneaky/more safe about stealing artwork from the TM app.

Changed:
U   trunk/Support/bin/CommitWindow.app/Contents/MacOS/CommitWindow
U   trunk/Support/bin/CommitWindow.app/Contents/Resources/English.lproj/MainMenu.nib/classes.nib
U   trunk/Support/bin/CommitWindow.app/Contents/Resources/English.lproj/MainMenu.nib/info.nib
U   trunk/Support/bin/CommitWindow.app/Contents/Resources/English.lproj/MainMenu.nib/keyedobjects.nib
U   trunk/Tools/CommitWindowProject/CXTextWithButtonStripCell.h
U   trunk/Tools/CommitWindowProject/CXTextWithButtonStripCell.m
U   trunk/Tools/CommitWindowProject/CommitWindow.xcodeproj/project.pbxproj
U   trunk/Tools/CommitWindowProject/CommitWindowCommandLine.m
U   trunk/Tools/CommitWindowProject/CommitWindowController.m
U   trunk/Tools/CommitWindowProject/English.lproj/MainMenu.nib/classes.nib
U   trunk/Tools/CommitWindowProject/English.lproj/MainMenu.nib/info.nib
U   trunk/Tools/CommitWindowProject/English.lproj/MainMenu.nib/keyedobjects.nib
A   trunk/Tools/CommitWindowProject/Icons/
A   trunk/Tools/CommitWindowProject/Icons/Action.tiff
A   trunk/Tools/CommitWindowProject/Icons/ActionPressed.tiff