limit placementStatus to Active/Inactive

previously we used placement status also to distinguish direct-hire from contract but this was unnecessary because candidateStatus can do the job for us

So candidate status supports the notion of 'placed' as an action...so if the user wants they can have a candidateStatus of 'Placed-contract' and 'Paced-direct-hire' if they want.
user active flag
Merge branch 'devel' of https://github.com/Exartu/Exartu-CRM into devel