Make dotfiles installable to an arbitrary location

Meaning the user is not obliged to install these dotfiles collection to
~/.dotfiles, but instead to any directory of his/her choosing.
Added missing augroup block ending in vimrc
Use syntax folding in Vim by default
Export $EDITOR env variable

This makes it available to external commands.
Add the 'music volume' command
Add align command, and align music list output
Better music output