Inspiration from Doug Black

See jjdougblack.io/words/a-good-vimrc.html and
https://github.com/dougblack/dotfiles/blob/master/.vimrc
Make .vimrc sections foldable.
Add intro to .vimrc
Use relative path to .cvsignore for portability
Add autojump
Disable Ex mode
Rework language specific settings
Disable K for man lookup
Add colourcolumn for git commit messages bodies