ALM-567 set safe_yaml to safe mode on startup
ALM-655 set PATH in whenever schedule
ALM-567 removed batch time interval
ALM-567 ignore source run_at settings
ALM-657 consolidated application constants in initializer
ALM-657 refactored f1000 source to work better with new background workflow
ALM-657 fixed test that broke because of refactoring
ALM-657 adjust non-queueable sources to new background processes