add insert queries for ref tables
Merge branch 'master' into refdata-derived-models
add RefDataModel - not finished yet
add getter methods to refdata manager
cut out the license header from derived/base.py for consistency
fixed errors in the ref data manager
add active_status to ref data queries
change get_or_create_option_collection method in refdata
add get_or_create_job_[type|group] to refdata
remove description parameter from the refdata creation methods
fix RefDataManager and add firts working test on it
add test_job_group_manager
add several refdata tests
remove session scope from datasource test fixtures
merged conftest.py