update documentation on AFFs
continuation definitions
add cont.c
clean up AFF support macros
set up of AFF calls done
tests for Arcueid Foreign Functions
add check_aff
add the T_CCODE typefn
macro definitions for Arcueid Foreign Functions
support functions for Arcueid Foreign Functions
fix continuations for T_CCODE objects
add a function to read the envr register
some fixes to the logic for handling trampolining of AFFs
various changes
set argument count in __arc_affaply
update documentation for AFFs