Add a preference that allows the user to decide if they want the calling and

Add a preference that allows the user to decide if they want the calling and
called GTs (if RI=GT) put in the (pinfo) source and destination (and thus into
the source and destination columns).

This may help (if the PCs change but the GT does not) or hurt (if the GT or RI
change but the PCs do not) TCAP's ability to identify which messages belong to
which TCAP "session."

svn path=/trunk/; revision=33097