FEATURE: `vcsh commit [$file]` -- Directly commit changes to a tracked file

[RichiH]

vcsh commit:

• Find all staged changed changes
• for repo in list found staged changes in repos; do vcsh run $repo git commit --verbose; done # with some magic to show which vcsh repo you are in

vcsh commit $file

• Check if $file is tracked by one repo only
• vcsh run $repo git commit $file

[RichiH]

Possible ways to seed the commit message:

• git commit -t -- sadly, this needs a file
• prepare-commit-msg hook -- sadly, this means changing the actual repo