add new client. PMT #98430

This is purposely done in about the simplest, most basic way I could come up with. The add client workflow in the old PMT was nice, did some auto filling via LDAP, lots of nice validation, etc.

I mostly just want to get this in as a stopgap in the new version in a way that users can enter new clients quickly. The edit client page works nicely and they are deposited right on the client page as soon as they've added the client, so I've trimmed the add form down to the bare essentials. Long term, we're still looking to replace the PMT's client tracking with an external CRM, so I'd prefer to keep things as simple as basic as possible in the meantime.