Update config.guess and config.sub to latest version available
Updated Makefile expects to find file COPYING. Renamed gpl.txt to COPYING.
Convert from old make to newer autoconf (Based on libuninameslist patches).

This should resolve bug http://sourceforge.net/p/libspiro/bugs/1/ and also
and downstream https://bugzilla.redhat.com/show_bug.cgi?id=925890
In function 'SpiroCPsToBezier' fixed 'return' with no value.
Highlight Patent Grant and Copyright in Authors for Raph Levien

Some updating based on debian libspiro 20071029-5 diff. Should highlight
that there is a patent grant for the curve technology in this library and
that most of the activity afterwards seems mainly to be patchs and edits.
Keep backwards compatibility by keeping void returns on original routines

Older programs may be expecting void for these calls, therefore keep same
and name new routines (with '0') to do same work that returns values.

Found older distro that produced a shared library but no static library.
Code alignment, plus a few alloc checks and cleanups