- fixed bug in tasks - wrong path to index file was being sent to workers
- created a new constant for irods OVERWRITE_WITHOUT_FORCE_FLAG error
- changed irods_utils.run_iput to throw OVERWRITE_WITHOUT_FORCE_FLAG if there is a file already existing there
- changed the logic in tasks to rollback only if the file doesn't exist with OVERWRITE_WITHOUT_FORCE_FLAG exception
- renamed a funtion from data_tests to run_tests_after<smth>