conditional breakpoint test working
forgot to remove -d: from shebang
delete breakpoint test working
location test working
action test working
the MAIN program stack frame is run in void context
Work consistently whether run from within the debugger context or the main program context
add method as_string()
stack test is now working
Don't trigger trace or step mode until after these control functions return

Also, the trace test now works
test for disable_debugger()
test is_loaded() and loaded_files()
add test for postponed
Forgot to add NullDB, used by the continue test
test eval