Move .h files from noinst_HEADERS to tincd_SOURCES.

This is the recommended way according to the Automake manual.
Build .tar.gz instead of .tar.xz.

Only FreeBSD's tar supports xz compression, the other BSDs do not. NetBSD doesn't even
like bzip2.
Update copyright notices.
Don't typedef the same struct in two header files.

Some (older?) versions of GCC don't like this.
Releasing 1.1pre8.