* Use define-command to define and register a command
* Introduce the notion of workspace to store intermediate and target files.
* Update Makefiles for new intended output paths

in HANDLE-TARGET. Replaced by better checking in CANONICALIZE-FULLNAME.
Changed ENSURE-VALID-FULLNAME to take the keywords of 'type' and
'original-name' which help print out a good error message.
Changed 'xcvb ssr' to output symbols in lowercase.

Converted more ERROR calls to USER-ERROR and fixed up the message to
be more clear.

When the simple-dispatcher constructs a dispatch set of forms, the
name of the dispatcher is now embedded into it. This makes it
much easier to find _which_ simple dispatcher interpreter might be
missing how to evaluate a form.

Fix a few glaring recent bugs.

Fix list-files and export it to the command-line.
Fix version extraction in bootstrapped build.
Update documentation: document :executable. Remove ASDF1 crud.

* extract fasl type from target:
 at least lispworks depends on pathname type and its fasl type varies!
* rucksack not available on clisp (and needed fixes; see our xcvb repo of it)
* accept compile-file failure semantics of clisp
* suppress duplicate entries for a directory in the source-registry:
 The first one wins, with its recurse and exclude flags.
* fix hello and test/runme
* fix various option parsing mistakes

Conditionalize away the xcvb farmer to not depend on iolib.

TODO for ECL: distinguish linkable object files from loadable shared objects.

* fix various bugs left over from .507.
* back out generation of Lisp files in object tree
 until we can provide build processes with a mapping from name to pathname.
* pass self-test.

Give proper semantics to resolve-absolute-module-name and resolve-module-name.
Make the hello example work properly.
hello now uses the generate functionality to extract version from parent XCVB.
Have log-format do fresh-lines for you.
Make sure builds are only interned once.
Recognize that builds may be invalid because of inherited conflict.

Easy functionality: version, ssr and a2x work.