Changesets that contain method/subclasses for obsolete classes such as
BlockContext have to be adapted to the new VI4 classes before being
filed into VI4.  This should not be hard.  I added a method called
vi4Obsolete that states the associations between old classes and new
classes.  I also added a menu option to FileList called 'find VI4
obsolete class' that will find the next occurrence of an obsolete class
so you can change it.

Most of the time you just have to change the name of the class.  For
example, from BlockContext to BlockClosure or from CompiledMethod to
CompiledMethod2.  But you also have to make sure your new
method/subclass is compatible with the new class.  Most of the new
classes understand the same messages, but most of them have a new
structure (new inst vars).  Also, some old classes have been replaced by
more than one new class, like Process has been replaced by Process2 and
SuspendedProcess.  Again, UndeclaredVariable>>vi4Obsolete will spell all
these options out for you.

The attached changeset adds the vi4Obsolete method and removes obsolete
classes.  This way filing-in a changeset that contains a reference to an
obsolete class will raise an error.  The error refers the user to
vi4Obsolete.

I did not rename the new classes to the old class names, so old
changesets can be caught as explained above.  It would be too risking to
assume that methods written for the old classes will automatically work
for the new classes.  They need to be changed manually so they can be
checked.

I have seen that the RefactoryBrowser and AspectS contains references to
old classes such as BlockContext and CompiledMethod and that is why
PhiHo was having problems with them before.  Now an error will be raised
on file-in, notifying the user that the changeset needs to edited.

The attached VI4 update, and all VI4 updates, can also be be found on
the VI4 website at http://minnow.cc.gatech.edu/squeak/VI4.

Cheers,
Anthony
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