Adding auto-completion

[CrazyCat]

Well, my actual trouble is that I've a reference table, but I don't want to limit the users to its value, and I don't want to let the users adding their own values in the reference (I've a system to update references).
So, I use autocompletion as an helper for user entries, and xthread for display and search.

I'll work soon on the way to have the auto-completion fully working with xthread for systems as tags, with the possibility to automaticaly add new entries in the field definition.