Compute metacontact big brother by comparing them instead of computing an absolute score for each one

fink/darwin ports with pkg-config installed.

request GPG password only when connected to server, before sending presence. fixes #3483, #3375, #3115

probably didn't make it through the patch before because of that.

'file://localhost/usr/bin/foo'. rip out the host and check the uri's for valid
before asking the user to send the files.