Merge branch 'maint'
wxgui: Fixes to solve issues using GL sinks on OS Xplotter/plotter_base.py: Create explicit OpenGL context, check if window is shown before realising context & only create PaintDC is paint triggered by WM message (OS paint event)Added SetSizeHints to WX sink windows so sizing occurs correctly
grc: removed 'old' grc keys from block_tree.
This does not remove the actual GRC files, just how we find them in the block tree structure of GRC.
Renames all blocks not updated to 3.7 style as "(old)" in name.
wxgui: fix scaling issue of nongl FFT plot (issue #523).
wxgui: add some noise to the fftsink_nongl test case.
wxgui: make dummy set_callback stub in nongl sinks.
Doesn't work, but also doesn't break the code.
Added PaintDC to 'plotter_base' so WX GL sinks will work under Windows.Changed 'notebook' SetSelection (deprecated) to ChangeSelection.
wxgui: implement persistence without using glAccum
wxgui: dead code removal and formatting cleanup
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