gr-qtgui: removing Guile-specific stuff since there is no way QtGui will work with Guile yet. Changed Python QA to complete properly.
gr-qtgui: finishing off removing references to 3D plotting in UI file.
gr-qtgui: removing references to 3D waterfall plot and changning QtGui API to remove bool that turns it on/off.
gr-qtgui: cleaning up unnecessary plotting calls.
gr-qtgui: don't delete the SpectrumDisplayWindow; as a QWidget, it takes care of itself when the parent is deleted.
gr-qtgui: missed lock call that was just deleted.
gr-qtgui: removing uncessary file of qtevents and objects.
gr-qtgui: removing unnecessary mutex and qtevent objects.
gr-qtgui: wip trying to figure out segfaults.
gr-qtgui: tightening up and cleaning up some memory leaks.
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