[rubis] (change:minor) Methods isLoggedUser have been renamed into isRegisteredUser.

[rubis] (bug-fix:minor( In Store-Buy-Now, Store-Bid, Put-Comment-Auth, Put-Comment, and Store-Comment replaced check for valid user with the one for registered user.

[rubis] (bug-fix:minor) In Store-Comment operation, the "to" param should be searched among form parameters.