Update the Persian input methods.

Update the Persian input methods.

 leim/quail/persian.el: Update which includes: (1) full compliance to
 ISIRI-6219, forbiden characters were eliminated and missing
 characters were added; (2) layer 3 of ISIRI-9147 is now
 implemented with a '\' prefix; (3) double entry of characters
 which were postfixed with 'h' is now supported; (4) lots of
 comment and additional pointers have been added.