Revert "s:Detect: only add readable files to &tags and doc"

This reverts commit 31dead6d8088dc7073d0e2645517ebc68d6de06b.
Generating the tags file after already loading the buffer burns me over
and over and over again, and I'm not convinced there was a problem to
begin with.
Fix supposed "Press ENTER" prompt

Closes #189, #190.
Support WIDE COLON in :Gstatus in some locales

Closes #228.
Don't clobber foldmethod in :Gedit :

Being a window local option, this can be pretty annoying.
Fix setting of foldmethod in :Gstatus

Closes #300.
Switch :Gblame <CR> to open commit

This is more useful than the previous behavior of reblaming at that
commit.  Said behavior is still available on -.
Merge branch master into guns