This module lets Makefile.PL automatically install dependencies
via CPAN or CPANPLUS.

* Features

- Letting the user enable/disable optional dependencies.
- Support sane defaults by probing for the machine's capability.
- If not inside a cpan shell, use CPAN.pm to install dependencies.
- Enable/disable the associated tests automatically.
- Supply UNINST=1 when it is safe and possibly needed.
- Checks MANIFEST to avoid unnecessary grepping of EXE_FILES.
- Utilizes CPANPLUS and/or Sort::Versions where feasible.
- Offers check-only and skip-all Makefile.PL targets.
- Offers check-only and install-only Makefile targets.
- Take advantage of the 'sudo' command where available.