Use arglocal/argglobal to keep global arglist intact
Merge pull request #1 from AndrewRadev/dont-clobber-args

Keep arglist intact
Make QuickfixFilenames script-local.
Make QuickfixFilenames function script-local

It's not used anywhere else.
If we're in the qf window, close it first

Otherwise some of the output will end up in the window.
Merge pull request #2 from AndrewRadev/avoid-using-quickfix-window

Avoid using quickfix window