Add run-coverity script

This really doesn't belong in Autotwiki but am stuffing it here for
now.  This is a preliminary script for doing Coverity runs, based on a
script I've been using for Inkscape.  Intent is to generalize it for use
with wayland and cairo.
Script to make sensing reports.

This is probably obsolete now, since we may not be doing more sensing
reports in the next year, but am archiving it here just in case.
plog: Further flesh out the script for logging patches
Two scripts to manage patches