DCW - test script now uses ./lib
DCW - Added test for get_matches() off-by-one error
DCW - RT91861 attempt 1

Changing _get_start_and_end_numbers() to add 1 to end_num mostly works,
but then gives false positives in in_filer() and get_matches()

About to try changing things at insert() time - NOTE: I'll need to recheck with
an older version of Set::IntervalTree.
DCW - Now varie insert() for diff Set::IntervalTree versions.

https://rt.cpan.org/Ticket/Display.html?id=91861

Plus removed new test from t/01_basic_operations.t
DCW - Calls to fetch() now also check version.