Working towards a BCCed [next].
This version <i>almost</i> works, except for a problem with restoring the
context namespace upon return (which produces very strange results!)
merge dkf-compile-misc-info
reorder to preserve main BC development branch sequence better
merge main dev branch
merge main dev branch
merge dkf-compile-misc-info
merge main dev branch
merge main dev branch
merge main working branch
merge main working branch
... and more silly errors
merge trunk
merge main working branch; made opcode work by getting callback ordering right
implement TclOO's [next] in bytecode