Set solarized hitrail global before setting color

This should make hitrail option work.
Reduce updatecount to 25

Save to swap file every 25 characters typed.
Raise history from 500 to 1000
Remove MiniBufExplr stuff

Haven't used at all in a long time, and the plugin kind of causes
weirdness. Left a diff anchor if I ever want it back.
Remove gratuitous executes in HappyBuffer code
Remove code for scratch buffer grepping

Kind of miss this as it was unixy, but I never do it anymore.
Remove quick git blame shortcut

Even though it's some nice vim scripting, I never use it; fugitive is a
billion times better.
Remove if wrapper around Gbdiff function

I'm sure there's a good way to do this but I haven't figured it out.
Improve Gbdiff: open all files, add shortstat