Lots more has happened.

Lots more has happened.

  * all reserved words are now banished
  * an ilayout now consists of, for each chain, a union of the ichains
    for each class on the chain -- makes referring to the bit which
    represents a superclass instance trivial; not yet hacked the
    effective method codegen to cope
  * unnecessary ichain and vt structures (ones which are copies of a
    superclass's) are suppressed -- we use the original directly
    (must document the new chain-tail tracking stuff); only one new
    ichain and vtable structure per class (though we still need all-new
    vtmsgs for each superclass).
  * header file output is complete and functional