[torqueusers] restrict job number of each type

[Xiangqian Wang]

Suppose I have 2 types of jobs Type-A and Type-B, with Type-A job uses
heavy CPU load and Type-B job uses heavy memory load. Now how I can
set maui to allow no more than one job of each type to simultaneously
run on each node.

I thought it might be a maui question so I also post this request to
the maui mail list, but if someone here already deal with this kind of
problem or have some clue on it, I appreciate your advice.

Xiangqian