Memory/BlkPool
The word Pag refers to an arbitrilly created MEM_PAG_SIZE unit of heap 
allocation.  TempleOS does not alter the CPU page tables after setting them up 
at boot in SYS_INIT_PAGE_TABLES, so the CPU hardware page size is rarely 
important.

BlkPoolAdd          Funct Add mem to BlkPool.
BlkPoolInit         Funct Make mem chunk into a BlkPool.
CBlkPool            Class class CBlkPool
MemPagAlloc         Funct {
MemPagFree          Funct Return non-task pags to BlkPool.
Scale2Mem           Funct Helps pick DiskCache and RAMDisk sizes.
sys_code_bp         GlbVar _extern SYS_VAR_INIT_FLAG U8 sys_var_init_flag;
sys_data_bp         GlbVar _extern SYS_VAR_INIT_VAL U8 sys_var_init_val;