[Bf-python] Py_CompileString() issues

[Ken Hughes]

I decided to take a break from tpgetset stuff for a while and try to 
figure out why sometimes the messages printed to the console by the 
built-in exception handler often show the wrong line (right line NUMBER, 
but wrong line CONTENTS) when the script is run with ALT-P.

I tracked the problem down to Py_CompileString() in the RunPython() 
function; it's passed the filename of the script.  When PyErr_Print() is 
called on to process an exception, it reads the line with the error from 
the file.  If the script in the text window has been changed, then the 
line printed can be incorrect.

Ken