The issue fixed is that most Lisps don't like
*default-pathname-defaults* being a logical-pathname.
Added a test for logical-pathname functionality;
it all works on CCL, and works better on other Lisps after the fix,
but there are still logical-pathname issues on SBCL, CLISP and more.
Also, a package cleanup of our test suite.

Also, use coerce-pathname in asdf-ecl and deprecate merge-component-name-type.

Apparently, :unspecific as pathname type isn't that well liked by ECL.

Enable extra debugging while testing (except on allegro personal where it blows up the heap)

Also, save defsystem-depends-on information for the sake of introspection by e.g. quicklisp.
Some documentation clarifications.

Makes it run much faster on my computer with my configuration, and
work on ABCL that lacks support for the previously-used **/*.asd.

Also alter a test so that a message will be displayed when ABCL passes.

* use only one package for everything: ASDF. This simplifies the upgrade a bit.
* export component-visited-p, record an index rather than a boolean.

Also
* On CLISP, only use custom:*module-provider-functions* when defined (2.49+)
* In Makefile, mrproper before debian package.
* Document that CLISP and SCL now support REQUIREing through ASDF.
* Fix mistake in run-tests that made it always use sbcl

Fix wild-modules to work nicely well with ASDF2.
Allow to pass multiple script arguments to run-tests.sh.
Tests now pass on ABCL.

Add tests for configuration files.
Also export enable-asdf-binary-locations-compatibility.