[AI] Advice for beginning JASS AI scripters

[Tommi]

Aside from using a JASS syntax checker and the JASS manual, here are the most important things what I've learned in a gist:

1. Use only native functions (marked native in common.j and common.ai). Blizzard-made non-native functions usually mess things up more than they help.

2. Check out what doesn't function in AI scripts: http://www.hut.fi/~tgustafs/wc3_donotworkinai.html

People are welcome to add more from their experience.