Latest changes in repository

Yesterday and today, I got right to work at some of the "decisions to
be taken"; after all, if anybody were to object: it's all version
controlled and we'll be safe anyway.

So, this is what I did:

 - Eliminated all 'unchecked' warnings by using generics as suggested by Marco
 - Eliminated all isJava15OrLater conditionals, since it was decided
to use Java 1.5+ anyway.

Ofcourse, I also fixed the nested structures and #n# reader expansion
which started all of this to start with.

In between some of these commits, I also replaced hashes with
WeakHash-es in LispThread, because that will allow Java threads to be
garbage collected (and so will the lisp threads as a consequence).

Some silence may come in the coming days, not because I'm done with
the initial burst, but because I'll have bad net access for 2 to 3
weeks.

Bye,

Erik.

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