Small tweak to admin options to let two fields be blank.

Passed in a blank=True argument to the stepNotDone and
conditionalOutcome fields under the NextStepCondition class, so that one
could save the form without putting anything for them, assuming the
boolean checkboxes are unchecked. Which I needed to do to delete the
Step Outcome for Check In.
Modest Changes to models.py and DB

Under NextStepConditions, when a manager is selecting from the drop-down
list of conditional Outcomes, the list doesn't update automatically
until any new Step Outcomes created with a name has been saved. Just a
small inconvenience.

I changed a bit of things and added Steps and StepOutcomes to fit the
previous Flow Doc.