CRM-13149 add relationship type id as a filter option for both 'paths', add tests & tidy up membership.create fn on test class in prep for adding it to tests
CRM-13149 array filter now working on relationship type
CRM-13149 fix BAO based reciprocal relationship get to accept type filter as an array per API, includes extracting function to be available from the BAO
remove unrelated debug code
CRM-13149 remove code comment
CRM-13149 additional test on api array as filter syntax
partial tidy-up of test class (while waiting for tests to run :-)
Merge pull request #1310 from eileenmcnaughton/CRM-13149

CRM-13149 add relationship type filter to relationship api (both paths)