some updates to my VCtools configuration

-	add `unstage` alias (for `vc unstage`)
-	add NYTprof dir to ignore dirs for `vgl` _and_ `vg`
-	make `vc stage` check for tabs before staging for policy 'CE'
-	tweaks to `vc stg-amend`
--		can now specify a SHA1 instead of number of commits
--		no longer blows up if unstash fails
--		better/safer return to original state by just `git stash save -u` the temporary state and then drop the stash
-	new command: `vc stash-files`
--		shows you what files are modified in the stash
--		*including* untracked files, if any