Added support for a switch being in more than one stack at a time.
Each switch has a 'primary' stack that it belongs to if it's specified with the '-i' parameter. Otherwise, it can be considered to be a part of any of the stacks of which it's a member. The main point of this is so that we can have switches that are on both the control and experimental networks. Note: Having a VLAN with the same name on two overlapping stacks is like crossing the streams: that would be bad. Not "all life as you know it stopping instantaneously" bad, but snmpit might get confused.
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