Update all pydave references to idbrii

Apply identity change to lots of other files.
Removes some unused abbrev.
sub: Cleanup whitespace settings and add snippet

Update david-snippets to get vim modeline snippet.

I read through the help on 'tabstop' and tried to make the snippet
follow that advice. I've also updated my whitespace settings to follow
that advice too.
Update spelling file

Add grep and plugin, remove some old junk, sort.