minor usability issues

Tooltips are missing, but that's already being worked on I noticed. Great! There are two other small things that would make Olive easier to understand:
1) Use for example "Commit ..." instead of "commit" in the menus. I wasn't 100% sure if I a dialog would be presented before committing, which scared me a bit. I figured that somehow I had to select which files were to be committed and to add a comment, but wasn't 100% sure.

2) I've been using Olive with the Inkscape repository, which is huge. This makes Olive slow at some points, even on my not-too-old quadcore with ssd. Could you show an hourglass in these cases? This keeps me patient, and doesn't require me to look at the processor load graph.

Otherwise, keep up the good work! Browsing the revision log is a breeze. I will definitely continue to use Olive, if only because as an amateur developer I keep forgetting bzr's command line parameters :-(