[Serusers] serctl + authentication failures (update)

[Gurol Akman]

recently i had reported 2 problems. while waiting to hear from the list, i 
ran some experiments as follows: first, i switched from ser-0.9.0 to 
ser-0.8.14. i then re-initialized the ser database. afterwards, i was able 
to do a 'serctl add ..." successfuly. also, i'm now able to authenticate my 
registration requests. so both problems seem be gone ;-)

i'd like to understand one thing better however: how does the information in 
subscriber database get to be used during the authentication process? stated 
in other words, which fields of the subscriber table get to be used during 
authentication?

thanks & regards - ga