postgresql: Fix the port option

Also clarify the description of the enableTCPIP option.

(cherry picked from commit c6529ac9eb03145449d0d8af4aa1123935a88a1a)
cups: Allow users in the wheel group to do admin actions

(cherry picked from commit 2cb492a8476785cbe9d278d8b0cfecd82603f00c)
linux: Update to 3.4.71

(cherry picked from commit 3b94410d866c44e8fdd92dbfea25e2a6eb5db4c2)
nvidia: Update to version 331.20

We no longer need the patches applied for the previous version so they
are removed.

(cherry picked from commit 0eeb78d74c470b2d781ca46427e2614ae4313da5)

Conflicts:
	pkgs/os-specific/linux/nvidia-x11/default.nix