Merge topic 'update_vtk' into pv-master

155b7f3 Update the scalar bar build time.
1967fef Fix compilation against libav 54 and OGG-Theora extension detection
a70fdae Merge branch 'fix-image-append-rel' into release
Merge remote-tracking branch 'pvvtk/pv-master' into HEAD

* pvvtk/pv-master:

Change-Id: I86748e0bb3022ad16b1fc6654f9de68ee315845c