PRINT-OBJECT method.

and less dense.

Rename search-path to source-registry, registry to grain-registry.
Extract ASDF implementation identifier from target, so we may use it later.

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

* The Makefile has a pre-release-test target, so no need to commit
 "yet another attempt at auto-validated release" anymore --
 I will test whether the code I have passes muster before committing.
* error out early if XCVB_OBJECT_DIRECTORY wasn't configured.
* Fixes to the regressions in the non-enforcing backend that had been
 made to implicitly rely on a previous run of the enforcing backend.
* Factoring out common option handling.
* Removing cruft from previous over-design of the computation class.
* Many thanks to Attila Lendvai for testing.

I had been compiling from an obj directory "dirty" with working files...
Also, have make-computation be a gf for the farmer.

Unhappily, XCVB somehow fails to run properly with it.

* makefile backend bug: make was doing the wrong thing when a.fasl depends on b.cfasl
  which depends on b.fasl. Apparently, when b.fasl was recompiled, a.fasl wasn't recompiled
  until the next run of make; we ensure it will by having a.fasl depend directly on b.fasl.
* move code around: remove style-warning when loading master as lisp.
* have master explicitly support pathname arguments
 (though princ must have done the right thing already before then).
* more moving code around: move specific commands out of main.lisp.

  * tweaked dependencies and moved code around in a vain attempt to avoid
   "undefined function" warnings, until I decided to DTRT and start writing
   a handler for warnings.

  * finally extended the driver to deal somewhat with catching warnings,
   getting inspiration from ITA's qres-build. However, some warnings are
   deferred and will need to be dumped in a side-file and handled later.

  * Make no-asdf support for SBCL more robust: 1- add clean-up forms that
   both remove the asdf module provider gunk and ensure that re-loading asdf
   will reinstate it. 2- use --sysinit /dev/null so that the /etc/sbcl*rc
   won't bork on lack of ASDF.

  * update TODO.

Support for generated code was added by extending
the "extension-forms" of Lisp grains.

Example declaration of the "generate" Lisp grain extension form (from cl-unicode):
 (:generate
  ((:gen-lisp "lists"
	      :depends-on ("conditions" "util" "specials" "packages"))
   (:gen-lisp "hash-tables"
	      :depends-on ("lists"))
   (:gen-lisp "methods"
	      :depends-on ("api" "hash-tables")))
  :generate-depends-on ("build/dump"))

Here, "lists", "hash-tables", and "methods" are files that are
generated by loading "build/dump" Each (:gen-lisp ...)  is like
a (module ...) and is parsed as such.  The dependencies of the
generated files (lists, hashtables, and methods) are keyed
as :depends-on, just like in a module.

Each :gen-lisp is parsed into a Lisp grain and stored in a
hashtable mapping the fullname of the :gen-lisp file to its grain
and generation dependencies.

Tested support for generated code by generating the make file for
cl-unicode, then building cl-unicode with the generated
cl-unicode-xcvb.mk make file.

Example of make command for generated files:
hash-tables.lisp: lists.lisp
methods.lisp: lists.lisp
lists.lisp: obj/cl-unicode/packages.fasl obj/cl-unicode/specials.fasl obj/cl-unicode/util.fasl obj/cl-unicode/build/util.fasl obj/cl-unicode/build/char-info.fasl obj/cl-unicode/build/read.fasl obj/cl-unicode/build/dump.fasl ${XCVB_EOD}
	./obj/_pre/cl-unicode.image --noinform --userinit /dev/null --disable-debugger --eval "(xcvb-driver:run (:load-file \"obj/cl-unicode/packages.fasl\")(:load-file \"obj/cl-unicode/specials.fasl\")(:load-file \"obj/cl-unicode/util.fasl\")(:load-file \"obj/cl-unicode/build/util.fasl\")(:load-file \"obj/cl-unicode/build/char-info.fasl\")(:load-file \"obj/cl-unicode/build/read.fasl\")(:load-file \"obj/cl-unicode/build/dump.fasl\"))"

Modified computations.lisp:make-computation to make
the default computation class 'concrete-computation.

* ensure installation directories exist
* add module forms to every file
* fix nickname registration
* add an eval-when for compile-time functions
* add support for xcvb.mk in the main Makefile
* trivially tested the result

* a dependency may recursively create zero, one or more lisp commands for loading files
* actual file dependencies and commands are accumulated into an environment object

* add a BUILD file for xcvb
* adding infrastructure to better track dependencies in general case
* documentation update
* Re-start a Makefile backend

* created a branch for the v0.1 prototype, documented how to access it.
* rewrote the normalizing and processing of the dependency mini-language.
* separated source vs normalized dependencies in lisp-grain objects.
* compute the latter at the correct time.
* fixed brokenness in the example as these dependencies were normalized (yay!).
* made fullname canonicalization more robust.
* refactored name resolution, fixed broken cases, handle conflicts.
* compiling (if not working) static backend -- to be debugged.
* reworked the misnamed simple-interpreter utility into simple-dispatcher.
* in .asd, comment out files that are borked by the rewrite.
* egoboo: put my name first amongst authors claiming massive rewrite.

* identify little languages for dealing with dependencies -- dependencies-interpreter.lisp
* hush compiler notes for SBCL
* allow to name pre-images
* fullnames now use leading / to distinguished from unresolved relative names
* now resolving names into actual grains.
* many utilities, including a parser for CL formals
   (over-engineering at work - but how else to be able to portably get user-readable error messages?)
* various small tweaks.

Joyce Chen came and helped me get unblocked by walking her through the existing code
and the work I am doing on static-backends. Thanks!

It won't even compile, but at least other people can see where I'm at.
Once again, see instructions in README to checkout a working version of the 0.11 prototype.