* Doxygen.
* Got rid of pos3L_approach()

* Make AIL_approach take a pos3 parameter from lua instead.
* [LUA AI] Adjusted scripts.
* Samll improvements to the alien lua AI.
* Got rid of AIL_distance()

* Extended pos3L_distance instead.
* [LUA AI] Adjusted the scripts.

* To account for the removal of AIL_distance()