Replaced wrong PyPJUA core message with wrong SIP core

darcs-hash:20090210171122-58103-827e6fddf12adffa4f8edd0cb4b2dff12986d6e9
Renamed pypjua package to sipsimple

darcs-hash:20090210172554-58103-0ecca9cdc022a64e8f7350af04c8dc9ec96d8218