Using LineEditor on miniBuffer
Removing alt trigger for menus
Firing up the debugger on exception, if desired.

When an exception occurs, the interpreter checks for the
flag_stop_on_exception flag. If set, instead of raising, the debugger is
started with the exception information, which is displayed in its status
bar. Also, during the interactive debugging, if any exception occurs,
the exception is also displayed.

Closes #39
Debugger with acceptIt, and reloadFrame (Closes #54)

Also, renamed VMProcess.rewind to VMProcess.reloadFrame.
Fixing bug on debugger exit.

QApplication didn't have its .exit method, and the debugger eventloop's
exit was being called twice.
printing some memetalk stack trace on exception
improving eval_do_send_or_call.

Because "throw_with_value" may not throw an exception (and instead,
start the debugger) the rsulting 'fn' may be None, which would break
setup_and_run. So lets check if there is a function to be executed
first. If there isn't, this is just a noop on the hands of the debugger.
No Workspace when booting idez