Derive pqFontPropertyWidget from pqPropertyGroupWidget.

In Rosie, a custom ParaView app, we need to access the visibility of the
property group associated with this widget. Currently, most custom widgets
associated with a property group, derive from pqPropertyWidget, which does not
store a pointer to vtkSMPropertyGroup. This change, fixes this problem for
pqFontPropertyWidget.

Change-Id: I0594f606c3f975fcf090e13a2f0d11ab0f4736d1
Remove obsolete pqProxyPanel subclasses.

These are the custom panel for filters in the old style
Properties panel.

Change-Id: I879ea63648e056515e256e5de660110b89994ea0
Fix PassArrays Properties panel.

Updating PassArrays proxy definition to use domains for setting up array
selections (rather than the now removed custom panel). This exposed a
bug in vtkSMInputArrayDomain where due to missing breaks in the switch
statement, the CellDataArrays domain ended up showing point data arrays
as well. Fixed that.

Change-Id: Iceb1c7e0dd9f613e8f874f11d1261839a259ca91
Add deprecation comments.

Still divided on whether we should show popup dialogs.

Change-Id: Iba739f02e4a2101de57ef200192fb8c6b958d609
Remove obsolete pqRubberBandHelper.

The last known user of this class has stopped using it too.

Change-Id: I9bebed874b569ec7ddb22a0a46e7603f7750ebf1
Add GetLabel for vtkXYChartRepresentation

Change-Id: I821f2abea772a3a54064da316682f54db704f174
Hide ShowBounds on Extract Selection panel.

This property is internal and doesn't make much sense to expose it to
the users.

Change-Id: Iad2beea5a0abc3c25ae611c96bbb5f9eb48affc2
Merge topic 'remove_obsolete_panels'

7a749789 Hide ShowBounds on Extract Selection panel.
79adb438 Remove obsolete pqRubberBandHelper.
ab02ba45 Add deprecation comments.
096974ec Fix PassArrays Properties panel.
6a1b11f9 Remove obsolete pqProxyPanel subclasses.
Merge topic 'rms-plots'

5910af77 Add GetLabel for vtkXYChartRepresentation
0a09d3e6 Derive pqFontPropertyWidget from pqPropertyGroupWidget.