* Add error handing in mod_freetdm for ftdm trace failures
* Allow freetdm signaling modules to specify a destroy function
* Added conditional forwarding to the freetdm gsm module
Just specify the conditional-forwarding-number gsm parameter in freetdm.conf.xml
* Added new 'gsm call' freetdm command for raw GSM calls which can be
used to enable/disabling network features (e.g call *93) without
having to resort to use a full originate that requires routing the
call somewhere when answered
* Miscelaneous cleanup of piggy coding style left over by one of the
previous authors -_-
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