php54: add pcntl option
znc: add support for modules, add fish and push module

Close #1148.
Add qpid v0.24

It includes both the broker and the C++ client lib. I had to do some hacks to
prevent the installer from putting thins outside $out.

Close #1134.
sqliteodbc: update to 0.995, add more metadata

close #1122
pythonPackages.substanced: correct sha256
libusb1: avoid -lgcc_s on darwin

close #1151
Clean up some option examples
Shut up "failed to resume" warning if there is no resume device
Add lots of missing option types
Drop environment.x11Packages

It doesn't do anything useful compared to environment.systemPackages.
Comment out nixos-gui

It hasn't built in over 2 years.
Use the "assertions" option instead of mkAssert
Make update-mime-database less verbose
Fix backward compatibility with Nix < 1.6

"with" used to be less lazy, so don't rely on that.  Also don't use
the "<" operator.
Agda: update to 2.3.2.2.

This update also fixes the build errors on hydra that were caused by
an incompatible version of haskell-src-ext.

Close #1153.
Updating SlimerJS to Git version for compatibility with fresh xulrunner
libedit: add FreeBSD support
Improve description of the users.extraUsers.*.description option

Fixes NixOS/nixos#278.
Generate manual for i686-linux as well as x86_64-linux
haskell-OpenGL: update 2.9.x branch to version 2.9.1.0