Move tests store_test.py, store_test2.py, store_test_webdav.py, store_test_gdrive.py, and store_test_webdav2.py into test store_tests.py
Remove test transparent_store_test_no_sync.py
Add module config.py, which stores a function to deliver a test configuration for each store implementation
Modify script run_tests.sh, to only execute the tests in module store_tests.py