New sh script to make standard debug version in linux. Also included the ONATIVE parameter by default in Release version. SDL2 is deacctivated by default, so there is no need to pass that argument to CMake.
* Ignore GNU Gtags and KDevelop files.
* Some debug stuff (now commented in) used to debug joystick/gamepad events.
* SDL joystick/gamepad support implemented and working.
* Tested in Linux with both XBox360 wireless and Logitech F710 gamepads.
Should work with any XBox gamepad clone wired/wireless.
* Works well using SDL 1.2 or SDL 2.0
* SDL scan values are currently hard-coded. Note sure how to implement
remapping at the moment (config file, GUI, ...).
* Documentation for the joystick support in Linux with SDL.