* fix mess with local and utf8 encodings.
* implement in_vc_cvs function.
* implement cvs commit command.
* implement cvs blame(?) command.
* option external diff program.
* check windows build for problems with stdout/stderr output
* (add spellchecking to commit dialog)
* (add function to change branches for VCS that support it)
* (add auto wrapping long line at commit dialog)
* (add commit function for a single file)
* (add git bisec support)
