[Ecls-list] Latest changes

[Juan Jose Garcia Ripoll]

I will be mostly offline during the following days, but I have been
working on holidays and wanted to give you an update of the most
important fixes.

* More efficient implementation of DEFMETHOD. NIL is no longer a valid
specializer in DEFMETHOD forms, though it is kept internally for
representing non-specialized arguments (this should change for MOP
conformance)

* All class slot definitions are now converted from list form to
standard-effective-slot-definition or standard-direct-slot-definition
classes.

* Fixes in the way the compiler handles &aux variables. Now they are
converted to a LET* form and only the free declarations and the bound
declarations for the &aux variables are propagated. This also solves a
problem with the scope of special declarations
	(defun foo (y)
	  (flet ((faa (&key (x y))
		   (declare (special y))
		   x))
	    (let ((y 4))
	      (declare (special y))
	      (faa))))
where (FOO 3) produced 4 before the bug was fixed.

* Added several regression tests (about 11) for the most recently
reported bugs. Some of these tests actually motivated the fixes
afterwards. It will now be a general policy of ECL to add one regression
test for each reported bug, except for bugs like failure to build,
SIGSEGV, etc, which are not reproducible.