Package tweaks to make CLISP complain less.
run-program/ and run-shell-command fixes and test updates.
wildening fix to issue found by CLISP.
! is used by EXT on CLISP, so use !p for defparameter.
More pathname madness for allegro.
Better upgrade.

* Fix bug found by CLISP regarding improper wildening.
* On CLISP, avoid nicknames in the package-definition-form.
* For ABCL avoid (a . #+foo b) pattern
* Also, test-clean-load now works on all lisps, not just SBCL

Tests: SBCL passes test-lisp and test-upgrade
Also:
* big refactoring of test infrastructure
* contrib/debug.lisp and (asdf/driver:asdf-debug) for debugging.
* remove aif and it, use the cleaner if-bind.
* backtrace support, with improvements from trivial-backtrace.
* integration of asdf-condition-control (originally from xcvb-driver)
* simplify the upgrade heuristic: always tries to upgrade once.
  The previous heuristic was too complex with too many failure cases.
  You are thus assumed to want a given version asdf
  if and only if it is in your source-registry.

I had failed to preserve the extension point cleanup-upgraded-asdf,
reusing the name the wrong way. Doing it right this time.

This notably includes the former xcvb-driver:run-program/,
a much better replacement for run-shell-command.
This also includes image initialization, dumping, quitting.

Also, tweak some tests some more.

Also, move wild-modules to a contrib/ directory.
Refactor tests somewhat, introducing a function touch-file.

Make default-directory a root pathname, remove it from source-registry.
Have it use lisp-implementation-directory.
Remove any attempt to use the "current directory".
Users who want that can still try to
	(pushnew '*default-pathname-defaults* asdf:*central-registry*)

Rename tmp/ to build/ and move asdf.lisp there. Update asdf.asd.
Rename implementation.lisp to compatibility.lisp.
Move *asdf-verbose* and asdf-message to upgrade.lisp

Avoids interspersed error output in CCL, or backtrace to terminal in SBCL.

New pathname functions to work around more logical-pathname issues.
See discussion with rpgoldman on asdf-devel, and see CCL ticket:953.
Also, tweak build to reflect recent refactoring of asdf.
WIP of define-package work needed for clean upgrade (still broken).

TODO: Create a define-package that can make it upgrade itself.

Add its forgotten source file test/lambda.lisp. Oops.
Skip one of its tests that mysteriously breaks on ECL_bytecodes.

Bug identified by avodonosov.

Also, fix make-pathname* to make CLISP happy.
Uniformly use "backward-compat*" in comments.
Rename operation-forced{,-not}-p to action-forced-p.
Shuffle some functions around.
Refactor operate into an :around and a regular method.

Remove debugging code from previous commit.

This restores the feature of do-first that was lost while refactoring ASDF
to fix the timestamp propagation issue.

The old asdf-bundle worked implicitly because of do-first:
fasl-op DEPENDS-ON compile-op, and compile-op has a DO-FIRST on the
load-op of dependencies, NOT a DEPENDS-ON, so if the compile-op is
"done" (which did NOT check the timestamps of dependencies),
then the dofirst is never consulted and load-op is never traversed.
In our new ASDF, we want to always traverse the load-op of dependencies,
so we can propagate their timestamps; however, we still want to only
actually load them if they are needed. Therefore, visiting actions
takes an additional flag "needed in this image", and each visited action
can be planned or not planned yet, and a not planned yet action can
be visited a second time to plan it after recursively visiting its
dependencies with the "needed" flag set.

Tests were fixed now to work now that this distinction exists.

Be more selective in what warnings get quashed when upgrading ASDF.
Skip bundle test on ABCL, ECL-bytecodes.
Sleep more in test1.

Found this bug during ASDF upgrade tests.
Add ecl_bytecodes to the upgrade test regimes.
Rename it from ecl-bytecodes to work with stupid Bourne shell.
Add xcl to test regime.

(preparing for a future better test system.)

Change declare ignore to ignorable to make ACL happier.
Remove slot for if-component-dep-fails.
Update some tests and workaround a failure on ecl-bytecodes.

Remove last traces of previous non-sensical :feature features.