Switch the default version of GNU Privacy Guard back to 2.0.

This patch effectively undoes @wkennington's update from 850da18. The problem
with GnuPG 2.1 is that its built-in 1.x compatibility differs from the one
provided in version 2.0, and these changes break 'gpg1compat in ways we don't
understand yet.

Commit 4c84621 attempted to remedy that issue by fixing gpg1compat to GPG 2.0,
but this caused further trouble because the GPG agent from versions 2.0 and 2.1
are incompatible, so users of the GPG 1.x interface (who were using GPG 2.0)
could not talk to their X session's agent (which comes from GPG 2.1).

The corresponding ticket is https://github.com/NixOS/nixpkgs/issues/4888.
haskell-git-annex: update to version 5.20141125
Merge pull request #4912 from ikervagyok/texlive

Updated texlive-base and texlive-lang to 2014-10-24
Add hivex, windows registry hive extraction library
Add libguestfs, tools for accessing and modifying virtual machine images
pythonPackages: add pyalgotrade
pythonPackages: add scikit-learn
Add mutt sidebar patch — Fixes #3222 (a PR by Leon Waldman)
Merge pull request #4282 from sztupi/crashplan

Crashplan

OK, it is an external service with unfree client, so let's declare that ensuring usability of the service is not our headache.
Merge pull request #4854 from offlinehacker/pkgs/libguestfs/add

Add augex, hivex and libguestfs
Add unstable NodeJS —  Fixes #4264 (mostly merges the PR from Bodil Stokke)
Add CMake 3.0 — Fixes #4363 — mostly-merging a PR by bbenoist
flexget: Bump version to 1.2.201 Added dateutil_2_1, guessit and bablefish dependencies
flexget: Use dateutils 1.5 instead of 2.1 for python 2.x support
pythonPackages: set guessit and babelfish as python 2.x only
Fix fetchurl references — Fixes \#4421
pythonPackages: add jrnl, a simple journal application for your command line
new package – libtomcrypt
depricate mozart-1.4 for mozart-2
removed shebang in builder.sh