#193 Forms authentication broken

[Craig Andera]

Comment from user:

I wanted to lock down my Internet-based wiki to use
Forms-based authentication. To do so, I had to revert
to build 1677, as the Forms authentication has been
removed from more recent builds, as described at
http://flexwiki.com/default.aspx/FlexWiki/Authentication%20Options.html

[Craig Andera]

Logged In: YES
user_id=879696

Fixed in build 1730.

What happened was, when I ripped out the half-complete
security implementation between 1677 and 1696, I assumed
that none of it did anything. This was clearly wrong.

I re-enabled support for Forms authentication only - the
pluggable architecture that was partly there before is still
gone.