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
skrooge: update from 1.3.2 to 1.10.0
Merge pull request #5209 from vbgl/skrooge

skrooge: update from 1.3.2 to 1.10.0
python-usbtmc: update 0.5 -> 0.6
wireshark: update from 1.12.1 to 1.12.2

Potentially fixes CVE-2014-8710, CVE-2014-8711, CVE-2014-8712,
CVE-2014-8713, CVE-2014-8714.
xmlrpc-c: update from 1.25.27 to 1.25.30
nss: security update fixing CVE-2014-1569
firefox-bin, thunderbird-bin: major updates

Close #5207.
qwt: update 5.2.1 -> 5.2.3

Remove patch that don't apply anymore; use sed instead.
qmmp: update 0.7.6 -> 0.8.2
python-robotframework: update 2.8.5 -> 2.8.6
python-robotframework-selenium2library: update 1.5.0 -> 1.6.0
duplicity: update 0.6.24 -> 0.6.25 (latest stable)
duply: update 1.7.3 -> 1.9.1
evtest: update 1.31 -> 1.32
babeltrace: update 1.2.3 -> 1.2.4
libosinfo: update 0.2.10 -> 0.2.11
yoshimi: update from 1.2.5 to 1.3.0

Fix build by adding LV2 support
firefox: Update to 34.0.5