change commit message

[MJochim]

When using git, the commit message after SAVEBUNDLE includes the bundle name but not the session name. This should be changed.

@thomaskisler also suggested to include the finished editing flag in the commit message. Seems a good idea to me.

Note that emuDB Manager parses the current commit message format, which is a kind of wtf because it was not meant to be machine-readable. Maybe the commit message should be more machine-readable? But then again, should git commit messages be mr?