add macro for testing if a block of memory is allocated
make tests of various scenarios of memory allocation
numeric data types
arc_init_datatypes set as part of initialisation process
use typefn_t's to obtain marker and sweeper functions for data types
add arith.c
add defs for typefn_t and prototypes for related functions
modify functions to make use of typefn_t's
use typefn_t's
use typefn_t's
use typefn_t's