add scraper to diagnose intermittent problems

This script scrapes cdash results for each submitter over time
so that you can see problematic machines and tests that fail some
of the time.

Change-Id: Idbe3c7cf53bc413e632e9d8f763f697a49a7ac30
Merge topic 'table2structured_one_piece_extent_fix' into pv-master

5c6f176 Update documentation/comment
1094afc Remove vtkPTableToStructuredGrid and fix vtkTableToStructuredGrid for parallel
Merge remote-tracking branch 'pvvtk/pv-master' into HEAD

* pvvtk/pv-master:

Change-Id: I7225d55a455db66bab3d909f441a64bc9c791e05
Merge topic 'add_cdash_history_scraper' into master

b36cfc7e add scraper to diagnose intermittent problems
Fix unisigned comparison warnings.

The corresponding libpng call has an int not an unsigned int.

Change-Id: Id07b04a05923ce333b8210ae81abcd3fbaeaad82
Merge topic 'vtkPNGWriter-compression-support' into master

e1094ed7 Fix unisigned comparison warnings.