API:Edit - Set user preferences

SetUserPreferences
SetUserPreferences action allows to edit each user profile by passing any profile parameters which are desired to be changed such as name, email, newpassword.

As shown in other features, sensible parameters must be passed by POST form.

Sample request and response:

 Request:  api.php ? action=setuserpreferences

Post parameters: pruserid = 23		  Obtained when the user has logged in. prusertoken = ber0cd5aa1bda4a5ve7lez230570b00na1a         Obtained when the user has been logged [ proldpassword = 123abc ]		  Old password the user used to have [ prnewpassword = 123abc ]		  New password desired by the user [ prretypepassword = 123abc ]		  Retyping the new desired password is required [ prname = "John" ]	  ''User Name. It is not a mandatory field'' [ premail = john.smith@yahoo.com ]	  User email address [ prnickname = "Johnny" ]		  User signature [ ccmeonemail = yes/no ]		  To send me copies of emails sent to other users [ premailflag = yes/no ]		  Enable e-mail from other users

 Response:  api: userpreferences: result: Success		 Other values: UserIsAnon, WrongPassword, BadRetype, WrongEmailAddress .