Merge topic 'fix_opengl_dependency' into pv-master

ad146c5 Fix OpenGL include dependency.
Merge remote-tracking branch 'pvvtk/pv-master' into HEAD

* pvvtk/pv-master:

Change-Id: Idd8a776d513faaa32f84bdf1986af37603cc08f0
Fixed uninitialized ivar valgrind defect

Change-Id: Id1aa8580fdb887f25dc7150d284b8c526829cebe
Merge topic 'fix_htgrids_valgrind_defects' into master

92bc8bf0 Fixed uninitialized ivar valgrind defect