Closure work - compilation work should be done, but untested. Now
need to create the closure blocks and be able to reference them.
Problems with local variables, as demonstrated by
:foo |n,m:| ?m (?n +)@;
1 2 foo
Normal closures appear to work - but nested closure fails with a SEGV.
There are lots of debugging messages, and a couple of new debugging methods:
Angort::dumpFrame() and CycleDetector::dump()