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.
Merge remote-tracking branch 'upstream/master'
gnuplot: version bump 4.6.3 -> 4.6.5
gnuplot: add optional Qt terminal
add ps to path for build
fix e18 cpufreq module: set setuid to freqset
added attrPath="qt53Full" and "attrPath="qt53"; qt-5.2 still default
vimpc: initial install script
Fix bloomfilter package on 32 bits

The git-annex derivation depends on bloomfilter and it's currently broken on
i686 because of this.  Upstream bloomfilter pull request already sent, this
is for the meantime.
elasticsearch: add support for plugins
Update Serf to 0.6.3
update hlint to 1.9.2
nixos/munin: change activationScript to preStart script

All activation scripts run in serial upon boot and nixos-rebuild switch
etc., in contrast to preStart which run before a service starts, and can
run in parallel with other services.

The munin(-node) activation script is particularly slow. Change it to a
preStart script so that it can run in parallel with other services and
not slow down boot (or nixos-rebuild switch).

This reduces (repeated) "nixos-rebuild test" time from ~16 seconds to ~8
on my (old) laptop.
Merge pull request #3377 from wjlroe/serf-0.6.3

Update Serf to 0.6.3
Merge pull request #3376 from nilcons/bloomfilter

Fix bloomfilter package on 32 bits
Merge pull request #3374 from FlashKorten/vimpc

vimpc: initial install script