sigrok: update whole suite to latest (2016-01)

Release announcement, 2016-01-30:
https://www.sigrok.org/blog/major-sigrok-releases-libsigrok-libsigrokdecode-sigrok-cli-pulseview

I first tried updating the projects in separate commits. But later I
found cyclic dependencies, that would break git bisect, so I ended up
squashing the commits:

* libsigrok: 0.3.0 -> 0.4.0
  Enable building libsigrokcxx.so, the C++ bindings for libsigrok, by
  adding doxygen, glibmm and python as build deps. This is needed for
  Pulseview >= 0.3.0. Also update the firmware (sigrok-firmware-fx2lafw)
  while at it.

* libsigrokdecode: 0.3.0 -> 0.4.0

* sigrok-cli: 0.5.0 -> 0.6.0

* pulseview: 0.2.0 -> 0.3.0
  New dependency: glibmm (due to libsigrokcxx.pc from libsigrok).

Note that collectd is incompatible with the new libsigrok release, so
I let it use the old one (0.3.0).

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