Fixed saving of STUN server address as a host name and not always an IP address. Better support for rotating DNS or SRV records.

git-svn-id: svn://svn.code.sf.net/p/opalvoip/code/ptlib/trunk@30921 023b2edf-31b2-4de3-b41e-bca80c47788f
Merged revision(s) 30870-30929 from ptlib/branches/v2_12:
Fixed long standing issue where PTRACE() within a static function of a PObject derived class needed to have four arguments. Now can take three and correctly discriminate between an object of module name string for the third argument.


git-svn-id: svn://svn.code.sf.net/p/opalvoip/code/ptlib/trunk@30930 023b2edf-31b2-4de3-b41e-bca80c47788f
Fixed order of NATTypes enum to agree with protocol values. Also documented that requirement.

git-svn-id: svn://svn.code.sf.net/p/opalvoip/code/ptlib/trunk@30932 023b2edf-31b2-4de3-b41e-bca80c47788f
Fixed loading of plugin directories when isntalled into $prefix directory



git-svn-id: svn://svn.code.sf.net/p/opalvoip/code/ptlib/trunk@30944 023b2edf-31b2-4de3-b41e-bca80c47788f