Tests suite base commited, initial cmake support

Hi,

The initial tests suite has been finally committed. All critical
issues discovered between 2.0.33 and now are covered except the
integer overflow checks (malloc&co).

It is possible to run the tests against an external GD or the cvs
version. You can find a little documentation in the README.TESTING
(http://cvs.php.net/viewvc.cgi/gd/libgd/README.TESTING?view=markup)
file in cvs. You need cmake to be installed on your system (as far as
I know, all decent distributions have it as well as windows).

Please let me know if you have any issues or troubles to run it or if
it works well :)

I would also like to know how work the tests with the libgd available
in your favourite unix/linux. If possible, please report issues to the
respective package maintainers, feel free to point them to me if they
need detailed informations or help to solve issues on their platforms.

Regards,
--Pierre