Fix t/option_l.t to match changes in Math::BigInt.
The tests now require Test::More version 0.88 or newer.
New MANIFEST.SKIP file based on the template in the ExtUtils-Manifest
distribution.Format CHANGES according to CPAN::Changes::Spec.
Add test files t/release-test-version.t, t/release-portability.t, and
t/release-cpan-changes.t.Convert test file t/02pod.t to t/release-pod.t and t/03podcov.t to
t/release-pod-coverage.t.