Window title is file part of directory.
Keyboard accelerators.

Fixed a couple of bugs along the way:
   - 'close' didn't work
   - new windows had the output panel visible
Output panel title is bold while running.
Add 'open location' to file list context menu.

Changed 'edit' to 'open', which more accurately reflects what
is requested (though the outcome is likely to be an editor,
for source files).