TODO_DONE


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*************************************************************************
**** TODO ***************************************************************
*************************************************************************

* remove [info frame] and [info errortsack], as well as all supporting
  code. These should be recoded using the data that NRE is
  keeping. Anything additional should ALWAYS choose to recompute on demand
  over precomputing things during normal operation

* bring up relevant mods (if any) from mig-alloc-reform 


*************************************************************************
**** DONE ***************************************************************
*************************************************************************

* changes to compiler and engine: old .tbc will not run, except with a
  "sufficiently clever" tbcload. The compiler and tbcload will probably
  need some work to adapt to the changes. This branch completely ignores
  these issues.

* tclAssembly.c and related are gone; it was an added burden adapting them
  while modifying the bytecodes and tebc, the decision was taken to remove
  it and do the work again "at the end"

* INCOMPATIBILITY - no more cmdCount
  There is no more [info cmdcount], or cmdCount based interpreter limits

* the compiler was simplified a bit, removing quite a few "premature"
  optimizations; these are now handled by the optimizer. In particular: all
  instructions are issued in the 4-byte variant (so that the optimizer can
  use the extra space), break/continue are not optimized to jumps until
  later, etc.

* there is a new optimizer that produces better bytecodes, especially in
  the handling of logic and exceptions. The optimizer itself is extremely
  suboptimal, the way it works can definitely be improved.

* INCOMPATIBILITY (?) - NRE stack is a real stack
  Tcl_NRAddCallback now OVERWRITES the currently executing callback!! Users
  now have to make sure that they save the received data[] in local vars if
  they plan to use them after pushing a new callback!

* remove [case]

* remove interp->result and all supporting code; remove other deprecated
  apis