digital: made the demod examples clearer
grc: Fixed Bug #485 by gracefully exiting when user sets GR_DONT_LOAD_PREFS=1 GRC_BLOCKS_PATH=
wxgui: dead code removal and formatting cleanup
core: added operator == for tags
core: added remove_tag_item()
Merge branch 'maint'
wxgui: implement persistence without using glAccum
Merge remote-tracking branch 'mbant/demod_examples'
Merge remote-tracking branch 'mbant/fix485'
Merge remote-tracking branch 'mbant/equal_for_tags'
grc: fixed problem of GRC_BLOCKS_PATH not being set in Windows
Merge branch 'maint'
digital: Updated constellation_receiver_cv documentation.
digital: Updated pfb_clock_sync grc xml file.
digital: Fixed bug in digital_bert_rx.py (thanks Charles Ru)
Merge branch 'maint'
Removed check for pending events during mouse drag of GRC blocks on FlowGraph canvas.
This is always true on Windows with latest PyGTK and so blocks would never move with mouse movement.
Disabling the check appears to have no adverse effects.
Added PaintDC to 'plotter_base' so WX GL sinks will work under Windows.
Changed 'notebook' SetSelection (deprecated) to ChangeSelection.
howto-write-a-block: Added example for Python blocks
Merge remote-tracking branch 'balint/windows_fixes' into maint