[git] Default to gvimdiff for 'git mergetool'
[git] Move uncommit alias to the commit aliases list
[git] Show author and date in 'git sl' output
[git] Add 'git mylog' alias to show own commits in the repo
[git] Set interactive.singlekey to minimize key presses
[git] Reindent config file to match git default formatting
[git] Minor config file cleanup