Change hxlcut options to -I/--include and -X/--exclude
Change options to -i and -x
Make sure the long version of every command-line option gets tested at
least once.
Refactored script tests to make them much shorter and more readable.
Add regular-expression support to hxlfilter (~ and !~).
Add min and max to hxlcount aggregates.
Save the optional URL for HXLDataset.
Roughed in library side of new hxlrename filter.
Added script for hxlrename filter.

Added test for multiple renames.