New asdf checkin on HEAD

Changes as follows:

*asdf-revision* is a new special variable.  It's a list (1 31) or
similar which corresponds to the CVS revision of asdf.lisp
- compile-file errors

The default behaviour for coping with compile-file errors has changed:

 (defvar  *compile-file-warnings-behaviour* :warn)
-(defvar  *compile-file-failure-behaviour* :error)
+(defvar  *compile-file-failure-behaviour* #+sbcl :error #-sbcl :warn)

Most lisp implementations (all that I know of except for sbcl) stop
and enter the debugger for catastrophic errors in file compilation.
SBCL otoh has a much finer warning/style-warning distinction and 
should not ever return failure-p unless for a catastrophic error

Fix printing of system-definition-error in CMUCL (thanks to Bob Rogers)

Moved a lot of messing around with 'last-compiled and 'last-loaded
properties into :before and :after methods on source-file so that
"don't reload if already loaded" works for new source file types that
users create.

There is a new operation load-source-op based on Kevin Rosenberg's
implementation of same.  I'm not altogether sure yet how this should
interact with last-compiled and last-loaded: suggestions welcomed

OPERATE now does the operation inside a WITH-COMPILATION-UNIT form, to
reduce noise from the compiler about forward definitions.  Courtesy of
Bob Rogers


Unchanged as follows:

Still haven't merged Rahul Jain's support for wild-modules or
core-deps.  I'm sure there's a cleaner way to do core-deps or even if
not there must at least be some sensible name for them.

(A core-dep is aiui a component on which all subsequent files in the
system depend - "like serialization, but less so": given that I'm not
happy with how serialization is specified either, it makes sense to
look for some way to unify the two features in some meaningful way)


-dan

-- 

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