First round of changes, mostly subprocess stuff. (py-execute-file): Better interaction with comint. Set comint-scroll-to-bottom-on-output to t. Wrapper buffer change in unwind-protect in case process filter fails. (py-shell): Start Python with -i flag to fix tty problem on Windows; presumably -- not yet tested. (py-clear-queue): New function to clear the pending exec file queue. Not currently keybound. (py-execute-region, py-execute-buffer): Added optional async flag (use via C-u prefix) to execute the region in a new asynchrous buffer, even if the Python shell is running. (py-append-to-process-buffer): Removed as obsolete. Comint provides this functionality. Removed fbound test defun of match-string. All modern X/Emacsen have this function.