ENH: Pass PDF_QUALITY_LEVEL in superbuild.

Change-Id: If95189a66e3fdcf7f1f0622f54aa336b59a6d5dc
BUG: Remove unused RunExamples.py imports.

Also move all import's to the top of the directory.

Change-Id: Ie3f30b0c52563887b7bfac02e8365e4c1d0d8449