environment support functions
some bug fixes in atstring reader
change usage of arguments in AFFDEF0 functions
change usage of arguments in AFFDEF0 functions
change continuation restoration
stack-based environments, and let AFF's make use of them too
make AFF's use normal environments like other functions do
continuations now preserve stack pointer and the previous continuation reg
use macros for CLOS_CODE and CLOS_ENV
restore offset for a continuation into a closure
add env.c
continuations now contain six elements
tests for environment functions