Vim: install the base16 color theme
Vim: some minor tweaks

- the command window is 1 line in height
- use the Base16 color theme by default
- add a background switching shortcut
- start an appropriate terminal on all Debians
- some other minor keybindings
Vim: bundles cleanup
Vim: tagbar + Lightline + colorcolumn
Merge branch 'master' of github.com:grn/dotfiles

Conflicts:
	vim/bundles.vim