BUG #14214: Fixes issues when tracing write-image.

Addresses a few issues with Python tracing of write-image and other UI actions.
The order of the traced events ended up being incorrect due to incorrect
flushing on the queue. Fixed that.

Change-Id: I8e90c8b7621530c04cecb43cc501c81db53248e4
projected tetrahedra test updates

Converted the projected tetrahedra test from and XML based test
to a python pvbatch test. the test will be skipped on GPUs that
do not provide the features needed to run the algorithm or have
known driver bugs.

Change-Id: I821ca26467bbfc4823230fcf1b247f083c0f9331
Merge topic '14214_fix_tracing_issues'

fda6f14 BUG #14214: Fixes issues when tracing write-image.
Merge topic 'update-projected-tetra-ctests'

7c7f3c9 projected tetrahedra test updates