Correctly sort metacontact data if one of the jids is a transport and not in our roster. Fixes #4208, #4195.

Corrected return values of zeroconf client in order to return true-evaluable values. related to #4051

 * remove js from some headers
 * set coding:utf-8 to allow real names in headers

sorry)

 * Remove some licencing problems
 * To do: same for images
 * See #4200

sys.executable.

Should save OpenBSD a patch for the next alpha :).