Accept [switch.]<module>/<port> format for ports, so that we can
	deal with ports not in the database (mostly for my own
	debugging sanity.)
    A -n option that prevents assign from changing hardware settings
    	(though, unlike TESTMODE, does read some information from
	the switches)
    Private VLAN support, through the -x,-y, and -z switches. There
	are only 5 letters of the alphabet left, so I've given up on
	memnonic switches.
    Worked a bit on making VLAN deletion more efficient, but with
    	little sucess

Private VLANs work like so:
Make a primary private VLAN with:
snmpit -m myvlan-primary -y primary
Attach a community VLAN to it like so:
snmpit -m myvlan-community -y community -x myvlan-primary -z cisco2.1/15
Put some ports into the community VLAN:
snmpit -m myvlan-community pc1:0 pc2:0