Fixes for UIOP:RUN-PROGRAM on ACL.

On ACL, the :INPUT and :OUTPUT arguments to EXCL:RUN-SHELL-COMMAND take
NIL for the behavior of inheriting input and output handles from the
Lisp process.  These were encoded as T in UIOP:RUN-PROGRAM, instead of
NIL, causing ACL to get errors trying to open T as a file designator.

Added a couple of test cases to test-run-program.script to illustrate
the problem.

Note that this fix does not provide the prescribed behavior for :OUTPUT
NIL (which should take the program's output and throw it on the floor).
There is a TODO in uiop:run-program explaining what's missing.  In
brief, ACL's EXCL:RUN-SHELL-COMMAND does not support this behavior out
of the box, so one would have to capture the program's output, and then
throw it on the floor.
Bump version to 3.0.1.1
Have run-shell-command actually return an exit code, like it used to.

Also, remove some extraneous comments from run-program.
Bump version to 3.0.1.2
Added ASDF_DEVEL_SOURCE_REGISTRY.

This will give the ASDF developer a special way of initializing the ASDF
source registry to load the libraries needed to run Faré's builder tools.
Fix debian package.
Merge branch 'master' of ssh://common-lisp.net/project/asdf/public_html/asdf
3.0.1.3: another fix to the debian package.
Merge branch 'master' of ssh://common-lisp.net/project/asdf/public_html/asdf
Check exit status in a RUN-SHELL-COMMAND test with verbose set.
Update the set of versions to extract for upgrade tests.
3.0.1.4: factor MAKE-PLAN out of TRAVERSE.

For consistency, MAKE-PLAN always returns a plan.
For backward compatibility, TRAVERSE always returns a list of actions.
OPERATE now calls MAKE-PLAN, not TRAVERSE anymore.
Happily, no one in quicklisp defines *useful* methods on TRAVERSE.
Thanks to foom for suggesting this cleanup.
3.0.1.5: Move TRAVERSE to backward-interface. Tweak convenience method generation.
3.0.1.6: have other traverse variants not call plan-actions, either
3.0.1.7: tweaks for XCVB: better support CFASL on SBCL, default-encoding.
Merge branch 'master' of ssh://common-lisp.net/project/asdf/public_html/asdf
3.0.1.8: trivial refactoring of format in function die.
Merge branch 'master' of ssh://common-lisp.net/project/asdf/public_html/asdf
Quiet a style warning.

In ENOUGH-NAMESTRINGS, the variable B was bound to a value computed only
for side-effect.  Removed B, lifting the call to ENSURE-PATHNAME out of
the LOOP form.
3.0.1.9: better OS detection for MCL and ABCL. Restore MCL support.

Thanks to Chun Tian (binghe) for his feedback.
MCL has issues with make-pathname failing to override defaults with an explicit NIL component.