tzdata: fix 'posix' symlink

(cherry picked from commit c2c90bf2bb77d5e094d74ab1835314f7f9ffa1fc)
tzdata: Update to 2014b

(cherry picked from commit dc224baba1f04495b23b17dbf7c75abf7f58ba1d)
tzdata: use symlinks instead of hardlinks

Hard links are not handled by nar, so installing from binary cache
unnecessarily duplicates data. Also, it's more common to use symlinks for the
tzdata package in other distributions.

(cherry picked from commit 1f2228cdc10807ed3b7ee0888b5cc8b6800e87b3)
Installer test: Remove fileSystems argument

The config function unintentionally ignored its fileSystems
argument. However, things still worked thanks to the magic of
nixos-generate-config. Yay!

(cherry picked from commit 077ecf43e52c68e47887a6bf89511d20e03aa12a)
Remove obsolete zsh help text

(cherry picked from commit 956f464fff861cee4a38945b20d9fc12c00f99ec)
nixos-generate-config: Use systemd-detect-virt instead of dmidecode

Dmidecode fails in our EFI test with the error "SMBIOS entry point
missing". But we don't need dmidecode because we have already have
systemd-detect-virt.

(cherry picked from commit 8c75ae38386a659f5e5a5dfbada9b5b614faacde)
Merge the EFI test into tests/installer.nix

(cherry picked from commit e9be441b62418783a1ea051588772889a7ac71d4)
gummiboot: Automatically disable GRUB

(cherry picked from commit 9bb209a3bdc6299fae90f372e7cc516c59c1aee5)
systemd: Require some more kernel features

(cherry picked from commit 728d3476baa63c0d2b0a9be9d70db852ea7a2fd9)
Installer test: Unmount filesystems after installation

Hopefully fixes failures like:

  http://hydra.nixos.org/build/10712833

This shouldn't be necessary, but it might be that the use of unionfs
is interfering with a clean shutdown.

(cherry picked from commit 437962ebb29208ae854a162b91723688295b3e9c)
Fix the simple installer test

http://hydra.nixos.org/build/10712818
(cherry picked from commit 27d47f3983e3de1a901b15f9b3590ad8c27ac8f5)
flashplayer: Update to 11.2.202.356

CVE-2014-0515

(cherry picked from commit 0ac20f072612bedd7769b905df1140a414820bf1)
Handle Zabbix agent and server both being enabled

This gave an error about the zabbix user uid being defined multiple
times.

(cherry picked from commit 05decd49ff35b247132585f74f291ed70d56958e)
Punctuation

(cherry picked from commit 1d8f7e63b08331a32649199a3dd88281cd924800)
Don't make the EFI tests release-critical

They're failing on i686: http://hydra.nixos.org/build/10712961

(cherry picked from commit a96f4920d51b96d700090b1671cbd1660e65bf99)
chatzilla: Use latest firefox's xulrunner

(cherry picked from commit 20c395d8aac553f7f2f87f9853e963682f11353e)
chatzilla: Update to 0.9.90.1

Also, make it work with recent Firefoxes.

(cherry picked from commit 8f5ebe495ca2a298456faf87fdf0be77761e9cb1)