Move default-handler(condition :: <warning>)

[waywardmonkeys]

This is currently in common-dylan ... we should be able to move it to dylan though since the debug-message that it uses is in dylan already.

When this happens, the documentation about this in the core reference should be updated.

[housel]

What would moving it buy?

[hannesm]

Why define it as sideways somewhere, if it can as well be defined where all its imports are from?

I mean, I don't know if there is any library depending on the side-effect that if you only import dylan, not common-dylan that there is no such default-handler for ... (well, debug-message is doing nothing on UNIX, printf using C-back-end)

[waywardmonkeys]

I think the question is what does not moving it buy? The current location means that you get one behavior if you use common-dylan, one if you don't and that makes it pretty confusing ... with only a small note in the docs.

It seems fairly clear that the current situation is a leftover from a time past where the debug-message wasn't available in the dylan library ... now that it is, we should have a consistent behavior.