- transform some of the logic into methods of classes in lsctables.
- get_username() is converted to a static method of the ProcessTable class
- the Process class gets a .initialized() class method to create one with sensible defaults copied from the append_process() function in process.py
- process.py's append_process() is replaced with a wrapper around the new method
- set_process_end_time() is turned into a wrapper around a new .set_end_time_now() method added to the Process class
- process_params_from_dict() + append_process_params() together are made to rely on the .pyvalue machinery of the ProcessParams class to choose the correct type string, removing all of that code from process.py
- ProcessParams's .append() method's invalid type string check is made to be more verbose to help debug problems
- delete abandoned register_to_ldbd()