ensure that the user-help for ACCEPT does not leave the program

for details see new in-code comments, step/next/cnext was broken here before

I've thought about disabling that completely for now until "someday" I add the ccatchpoints (accept, runtime error/exit), but I've dropped that thought quite fast. The reason: now "only" the continue command is interrupted and the user was interrupted by the ACCEPT in most cases anyway (only exception is a rare-case redirected stdin).