Move source-if into a separate file.
Remove obsolete/unnecessary header comment.
Remove obsolete sources. These are elsewhere.

In particular, moved into .bash.d/ and sourced by .bash.d.source.
Remove PERL5LIB. Not necessary with perlbrew.

...and installed modules.
Add missing semi-colons. Minor tidying.
h4x: Add list entry for cmus GitHub.

Not sure if this works or not.