specl: fix --version and --help formatting with stdlib-33 getopt.

* src/specl.in (prog.version): Separate out copyright notice...
(prog.copyright): ...to here.
(prog.description): Latest stdlib getopt doesn't need double
newline paragraph separators.
* src/version.lua.in (M.COPYRIGHT_NOTICE): Rejustify slightly.
Point to gnu licenses webpage rather than COPYING file, which
might have been lost during installation!

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
specl: return non-zero exit status when there are failing specs.

* src/specl.lua (run): Return false when there are failing tests.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>