* Fixed and further improved AIL_positionshoot.

* Fixed bug introduced in 6341ad4 so that it works again.
* Now tries to make sure that there'll be enough TUs to fire at least onece.
* Extended AIL_see.
* Fixed minor bug in AIL_InitActor.
* Added a very basic approach funtion to the LUA AI.
* [LUA AI] use ai.positionapproach.

* Not in a very smart way yet...