Refactor the state model

[troeger]

The state model for submissions is too deep weaved into the code. Some proposal for an explicit state machine implementation:

#states
SUBMITTED=1
COMPILETEST=2
WITHDRAWN=3
NotApplicable=object()
#inputs
NEW_SUBMISSION=1
JOB_REQUEST=2
WITHDRAW_REQUEST=3
def transition1():
   if not bedingung:
        return NotApplicable
   datenbank_aendern()
   return WITHDRAWN
transitions = {}
transitions[SUBMITTED, WITHDRAW_REQUEST] = [transition]

[Feinbube]

Is this still active?