SDS: Add -f switch to Next command to force step-over mode

Add -f switch ("force") to the Next command to set the temporary breakpoints regardless of instruction type.  This is useful at
the bottom of loops or to avoid going off into unrelated code should an interrupt or memory paging trap occur.

SDS/sds_cpu.c

@@ -1518,8 +1518,9 @@ uint32 inst;
 
 reason = Read (P, &inst);              /* get instr */
 if ((reason == SCPE_OK) &&
-    ((I_GETOP(inst) == BRM) ||         /*  if BRM or     */
-     (I_POP & inst))) {                /*  POP or SYSPOP */
+    ((I_GETOP(inst) == BRM) ||         /*  if BRM or        */
+     (I_POP & inst) ||                 /*  POP or SYSPOP or */
+     (sim_switches & SWMASK('F')))) {  /*  Force switch     */
         returns[0] = (P + 1) & VA_MASK;
         returns[1] = (P + 2) & VA_MASK;
         *ret_addrs = returns;