Adding PDU MIB from Raritan:
http://www.raritan.com/c/f.1005/p.firmware-request/support/dominion-px/v1.5.7/pdu-mib/
Added MAU-MIB.mib (renamed from MAU-MIB.txt).
Merge github.com:ww9rivers/SnmpMibs
Updated CISCO MIBs.
Added files, deleted duplicate files (different names) and updated some.
Deleted SNMP-MPD-MIB.txt (redundant with SNMP-MPD-MIB.mib).
Added HC-PerfHist-TC-MIB.mib.