Better fix for CMSG definitions

It turns out autoconf versions are not consistent with $ symbol escaping
which can cause incorrect definitions. Revert to AC_CHECK_TYPE instead.
Its a bit more verbose in configure.ac but works more often than not.
Translation: update POT content
Languages: Georgian
Languages: Georgian dialect
Copyright: Relicense helpers by Treehouse Networks Ltd.

Update the license on helper code designed and authored by myself using
the BSD 2-clause license. This makes the example helper code and license
more legally acceptible for use as a basis of proprietary helpers while
remaining compatible with GPL for distribution with Squid.
Copyright: Remove explicit claims on src/ by Treehouse Networks Ltd.

Amos Jeffries is listed as author in CONTRIBUTORS and Treehouse Networks
Ltd. listed in SPONSORS and commit messages.