Making sure scripts and tests check for GNUSOCIAL defined (instead of STATUSNET)

Making sure scripts and tests check for GNUSOCIAL defined (instead of STATUSNET)

Orbited plugin may not work at all anymore, I had no means to try it.
But there's a check whether 'LACONICA' is defined there, which is a
very unlikely thing in the future. So far only tests and scripts have
been migrated consistently, though.