REDUCE Code

all the machine code that it generates. And it now gets a serious way through
the alg.tst test file. Well it moans that I have not yet implemented "BIGCALL"
and it moans repeatedly that my implementation of what is supposed to
be a tail call in fact does a regular one but then exits. And at some stage
it misbehaves - but it sort of feels as if it is getting rather close to
completion! And the bugs fixed in this checkin are all pretty shallow
ones.