multi detect behavior

[sh0e]

changed only on dev will only check disabled==1 and ismulti==0 for multis
prevents blacklist behavior and prevents counting multi accounts

also added $config['allow_multi'] for allowng multiple accounts.. enabled on deev server

[The Beatles]

Thanks!
Suggestion: $config['max_multis'] -- shouldn't be too hard, I'll implement it later on dev.

[sh0e]

done