buildNodePackage: add shell hook for development
nixos/znc-service: don't use types.string (it's deprecated)

Apart from s/types.string/types.str/ (or types.lines where appropriate):

* port is changed from string to int.

* extraFlags is changed from types.string (with unfortunate merge
  semantics) into a list of strings. A list of strings merge better:
  one space is added between elements.
ncmpc: updated to version 0.23.
Merge remote-tracking branch 'upstream/master'
Add SpiderOak secure backup service.
added snes9x-gtk with pulseaudio support
Merge remote-tracking branch 'upstream/master'
made changes requested by pSub
gnuplot: version bump 4.6.3 -> 4.6.5
gnuplot: add optional Qt terminal
add ps to path for build
Fix runtime dependencies for virtualenvwrapper
Merge pull request #3365 from geerds/virtualenvwrapper

Fix runtime dependencies for virtualenvwrapper
emv: Initial install script
emv: perl isn't needed after all
Merge pull request #3367 from FlashKorten/emv

Emv
calibre: update from 1.45.0 to 1.46.0
fix e18 cpufreq module: set setuid to freqset
added attrPath="qt53Full" and "attrPath="qt53"; qt-5.2 still default
nix-ssh-serve.nix: Remove unnecessary check

ForceCommand ensures that we always run nix-store --serve, so there is
no need to check SSH_ORIGINAL_COMMAND.