[TxMt] LaTeX completion

[Alex Ross]

LaTeX users:

My plan is to remove most of the completion commands and latex  
snippets from the LaTeX bundle.  They will be replaced by a single  
command.  I have a prototype under construction, you can see how it  
works here:

http://lasersox.net/LaTeXCompletion.m4v

Basically there is a tree of completions, and you can navigate them  
just by typing.  We can work citation completion, and all existing  
snippets into this system.

Thoughts?