Bug fixes, type pointers weren't being migrated correctly
crash fix, in migrate_stack, when migrating to null block
add some BUGS, clear out dead code
New plan for Actor (now it is just a block with shared state)
Fixes for actor change. Disable some tests written against old actor api
fix actors, and fix bug where 'return' inside closure was escaping
add Block.to_closure and Function.to_closure