* add uid and uid-match upload tests

* increase coverage of engine uploads w/ job (+enable job creation from data_builder)

* add test_roothandler.py to cover the /api root endpoint

* add more tests for session template compliance checking

* add tests to cover project/collection stats retrieval (requested w/ stats=true)

* add tests to cover most of api/handlers/userhandler.py

* make sure that unit test coverage is included in the overall report