bugfix to testing module: only check second condition if 1st is true
more passing tests for flatten transform (suspend/continue), WIP
more tests and bug fixes to flatten transform
code and additional tests for flatten transform, closes #100
remove some debugging code
update to r18541, note: may require a rm -fr lib/exist to build properly
add tests to pre-release-testing
flatten:merge-document()
unflatten transform (WIP)