[Serusers] Check_from() and check_to() issue

[Jon Mansey]

Hi

I seem to be having trouble with check_to() for registrations and
check_from() for invites, even though I have them right after *_authorize
and challenge calls. Maybe I don't fully understand the test that it does
but it prevents registration from all my clients seemingly. What is the test
failing on? Im getting 401 unauthorized. If I comment out the check_to()
test, I register just fine.

Could someone more fully explain the test criteria here so I can see where
my problem is, thx.

V0.9.3

Help appreciated,

Jon