This fixes the path to source files in some unit tests and allows
to get rid of a few duplicate lines.

on the current ruby-dev instead of a specific version.

Fix python 3 issue

x11 driver: handle errors caused by missing locales

Fix cocoa check on osx mavericks and above

- Save and correctly restore console input mode, ie. do not
   change settings of the original console.
 - Fix hiding of cursor.
 - Free console again if the driver actually created a new one.
 - Default canvas size is current window size.
 - Base calculation on current font.
 - Properly handle press and release events of up to 5 mouse buttons.
 - Map right mouse button to button #3. This is a change in behaviour,
   which is desirable for cross-platform codes.
 - Generate two click events for double mouse clicks.
 - Mouse wheel support, creates button press events. Button numbers
   are identical to X11 mappings.
 - Handle window buffer resize events.

unit test for the problem. Bug found by Bastian Märkisch <bmaerkisch@web.de>.

when BUFSIZ is smaller than 1000. Bug found and patch sent by Bastian
Märkisch <bmaerkisch@web.de>.

outside the canvas.