Bump LXC to 1.0.0.beta1

Tested locally. Builds and works for me.
vala: update to 0.23.1, remove old versions

set license to lgpl2Plus
add myself to maintainers
and some cleanup
vala: fix typo in license
A larger Octave build with GUI
Fix Octave-full evaluation
apache-httpd-2.4: revert "enable building the 'event'-based mpm worker"

Commit 0c3d910cd027a926ffc8538ea60cf2da099d7808 didn't have any effect.
The 'event' MPM module isn't built because our version of APR is too old.
tailor: Add extra source URL
mc: update from 4.8.0 to 4.8.11
xlibs.xf86videointel: update from 2.21.9 to 2.21.15
Add meta.branch to some packages
Merge pull request #1465 from msackman/master

Bump LXC to 1.0.0.beta1
Pass correct Qt version to octaveFull for GUI
haskell-poppler package is added.
haskell-poppler: re-generate expression with cabal2nix
nodejs: update from 0.10.22 to 0.10.24
cryptsetup: update from 1.6.2 to 1.6.3
Merge pull request #1470 from iyzsong/vala

vala: update and cleanup
New expressions: yi, yi contrib and dependencies
Merge pull request #1474 from bennofs/editor-yi

New expressions: yi, yi contrib and dependencies
haskell-pretty-show: update to version 1.6.5