added data filtering info and link to a copy of config file to preserve info about how data was modified; made a copy of the config file and put it with the report; created a set of default filters that users can take advantage of in filters.py; added user control over multiprocessing (default is multiprocessing off); changed the formatting of part of the config file; added details about data sizes to the warning that's shown when comparisons are disqualified based on size

git-svn-id: https://svn.ssec.wisc.edu/repos/glance/trunk@51 8a9318a1-56ba-4d59-b755-99d26321be01