RELMEM - release unused memory from the memory hole.

Usage:

B:
   relmem();

C:
   void relmem(void);

Description:

If there is a chunk of unused memory at the high end of the program's memory, RELMEM will release it back to the system. Only an integral number of 1k blocks will be released. Judicious use of this function can improve the real time response of a program and reduce its running cost.