digital: bugfixes to ofdm_chanest, HPD and frame EQ
digital: crude hack to prevent the HPD from crashing flow graphs
digital: GRC and Python bugfixes for OFDM
Merge branch 'maint-ofdm' into master-ofdm

Conflicts:
	gr-digital/include/CMakeLists.txt
	gr-digital/include/digital/CMakeLists.txt
	gr-digital/lib/CMakeLists.txt
	gr-digital/lib/header_payload_demux_impl.cc
	gr-digital/lib/ofdm_chanest_vcvc_impl.cc
	gr-digital/lib/ofdm_chanest_vcvc_impl.h
	gr-digital/python/ofdm_txrx.py
	gr-digital/python/qa_ofdm_chanest_vcvc.py
	gr-digital/swig/digital_swig.i
blocks: fix for ~file_source crash, Bug #550
audio: switch default also device from hw:0,0 to default, Bug #551

Conflicts:

	gr-audio/lib/alsa/alsa_sink.cc
	gr-audio/lib/alsa/alsa_source.cc
Revert "wxgui: Fixes to solve issues using GL sinks on OS X"

This reverts commit 5f0aaf3d5397675d6f87acd7ab20526ac1fb0d4e.

Issues reported with blank displays on some non-OSX systems.
Merge branch 'maint'

Conflicts:
	gr-audio/lib/alsa/audio_alsa_sink.cc
	gr-audio/lib/alsa/audio_alsa_source.cc
Merge remote-tracking branch 'martin/maint-ofdm' into maint
Merge remote-tracking branch 'martin/master-ofdm'

Conflicts:
	gr-digital/examples/ofdm/ofdm_loopback.grc
Merge branch 'maint'
blocks: fix missing dynamic tag implementation
channels: new frequency selective fading block