su_root.c: fixed truncation in su_task_cmp(), refactored su_task_execute().
su_root.c: fixed truncation in su_task_cmp(), refactored su_task_execute().

Updated documentation.

darcs-hash:20060925181808-65a35-447aab5c4c4c258105dfdb1d507ff954eb61f001.gz

BelledonneCommunications/sofia-sip,jart/sofia-sip,jart/sofia-sip,erdincay/sofia-sip,unispeech/sofia-sip,unispeech/sofia-sip,xhook/sofia-sip,xhook/sofia-sip,xhook/sofia-sip,jart/sofia-sip,BelledonneCommunications/sofia-sip,erdincay/sofia-sip,erdincay/sofia-sip,BelledonneCommunications/sofia-sip,unispeech/sofia-sip,xhook/sofia-sip,erdincay/sofia-sip,BelledonneCommunications/sofia-sip,unispeech/sofia-sip,xhook/sofia-sip