avoid segfault when sofia tries to update the callee id at the same time as the outbound call is transferred

add 'sofia global siptrace on' so we don't have to always teach people to enable sip trace on each profile

add sofia profile <profile> gwlist up|down to list up or downed profiles for feeding into mod distributor to exclude dead gateways

switch_utils: Add day of week 3 letter initial usage in "wday" field in the dialplan.  Example : mon-fri.  Using number as before is still supported.  Several public switch function are available.

switch_utils: Add date time range string compare function switch_fulldate_cmp. It usable in XML dialplan with date-time. String format example : 2009-10-10 14:33:22~2009-11-10 17:32:31.

switch_utils: Add time of day string compare function switch_tod_cmp.  It usable in XML dialplan with time-of-day.  String format is hh:mm:ss you can define a range like this : 09:00-17:00  (Second are not optional)