TRACE
Turns on "trace" mode, which shows the program line being executed during runtime
Implemented by: ansifull, a2int, Applesoft, TI994, Simons1, BBC, ABasiC
With variations: ataplus (does not show line number for GOTO and GOSUB targets, nor FOR and WHILE lines), atxl (does not show line number for GOTO and GOSUB targets, nor FOR and WHILE lines)
Also written as: