pythonPackages.cvxopt: added package
python: make 2.6 and 2.7 expr similar, introduce includeModules

When includeModules is true, python is built with all optional modules
as part of derivation.
pythonFull -> python with all modules, pythonFullWithPkgs -> buildEnv
nixos/syslog-ng: Add option configHeader
dovecot: Update from 2.2.13 to 2.2.14
nixos/logrotate: Fix spelling mistake
logstalgia: update from 1.0.5 to 1.0.6
fix mpdcron
firefox: use -O3 on 32bit linux to reduce memory usage on linker
pypy: disable test_zipfile64 because timeouts
python27: Remove avoid daemon thread shutdown #i21963
Merge pull request #4483 from edwtjo/cvxopt

pythonPackages.cvxopt: added package
readd pythonPackages.hgsvn
Add Blink, a simple sip client.
fix eval
simplify
Merge pull request #4495 from NixOS/pythonFull_improvements

PythonFull improvements
Replaced retroarchBare with retroarchBareMaster, also added a few new libretro cores

retroarchBare was too old for any practical use at this point, so it was removed in favor
of fetching releases from git. RetroArch often recommends checkout out the latest git master
if you are on a desktop platform, so we are conforming with their recommendation. I plan on
bumping the git of retroarch and each core every month, and I plan on adding more libretro
cores in the future.

The libretro cores that were added are nestopia, quicknes, snes9x, and vba-m

planned next are : bsnes-accuracy, bsnes-balanced, bsnes-performance, a few libretro mame ports

Closes #4448
Merge pull request #4551 from vandenoever/blink

Add Blink, a simple sip client.
substituteAllFiles: add derivation

Closes #4145