additional signify options

Some of these cause buffers to be written to disk.  Given the way I work, this
is probably not a problem.  At worst, I suspect it'll involve becoming very
familiar with how the git-wip plugin works :)
set secure, set exrc

See https://coderwall.com/p/tqns-w

This may not do exactly what I'm looking for, but it's a start...
folding tweaks