Fixed typo in transition guide.
Fixed release of get rule objects.

Partial revert of b4c03b992c.

Fixes #262.
Fixed leaks of joystick mutable arrays.
Start reopen test in fullscreen.
Merge pull request #306 from SephiRok/patch-1

Start reopen test in fullscreen.
Made X11 Unicode table const.
Updated comments on global variables.
Removed uses of GLU in tests.
Only generate Doxyfile if generating docs.

Fixes #307.
Formatting.