Darkcoin: new package (v0.9.13.15)

Darkcoin is a privacy-centered crypto-currency.
Litecoin: Update to 0.9.3-preview5

Now Litecoin expression lives in a single file, litecoin.nix
schismtracker: new package
icedtea: Fix updater to work with latest icedtea changes
icedtea: 2.4.7 -> 2.5.3
icedtea7_web: 1.5.1 -> 1.5.2
icedtea: Simplify update script
icedtea: Regenerate sources.nix
icedtea7: Fix patch
gnuradio: update 3.7.5 -> 3.7.5.1

Build tested.
python-actdiag: update from 0.5.1 to 0.5.3
python-blockdiag: update from 1.3.2 to 1.4.7
python-construct: update from 2.5.1 to 2.5.2
python-nwdiag: update from 1.0.0 to 1.0.3
python-seqdiag: update from 0.9.0 to 0.9.4
Update gnumeric

goffice is also updated. goffice is maintained by the gnumeric people
and released in sync with gnumeric. gnumeric 1.12.x corresponds to
goffice 0.10.x.
pythonPackages.sure: 1.2.7 -> 1.2.8
pythonPackages.greenlet: 0.4.4 -> 0.4.5
Add pythonPackages.azure
whitespace change for kde4 test to force rebuild :(