Rename load_datasets_for_modules to load_dataset to convey intent
Make it possiblt to override the dataset dir name on a per database case
Refactor fixture loading into a down phase and an up phase
Introduce mechanisms for setting a per database fixture dir
Configure some more settings in generated jar file
Ensure some default values are set
Add improved helper for creating database definitions
Ensure that datasets are unloaded/loaded in the correct total order rather than in the correct order within each module
Add test_load_dataset