chromium: Add support for grsecurity
Make XFS kernel config options optional
vim: add config option to generate vimrc
Add nixopsUnstable package
XXX Workaround for grsecurity
flashplayer: Update to 11.2.202.310 (fixes 4 critical security vulnerabilities)

Fixes CVE-2013-3361, CVE-2013-3362, CVE-2013-3363 and CVE-2013-5324.