snmpit:
-First part of a major reorganization/rewrite.
-Added checks for node ownership before changing port values and adding or
  removing VLANs.
-Translation tables (mac<->tbxxMM:N,tbxxMM:N<->switch:port,port<->ifIndex) are
  now global and get initialized whenever necessary.
-Made port config changes work for ciscos. (speed and duplex)
-Added ability to specify ports as tbxxMM:N for cisco port config changes.
-Some general cleanup/reorg/rewrite of old ugly code.