stop spawning ssh-agent in .login (even conditionally)

this was done in an attempt to stop the creation of duplicate ssh-agent processes
(although it doesn't seem to have worked, particularly)
tweaks to gRip config

stop creating stupid useless comment in ID3 tags
stop taking so many useful punctuation chars out of filenames
various and sundry other crap that came from using a new version
make [[ and ]] work in vim (finally)

this is the recommendation of vim's help
seems to work well so far
added a helper for my song files (swap artist/title)

this is mostly used in mixes/mixes, but could potentially be useful elsewhere
maybe (but probably not)