[HECnet] two new systems up

I've put up two new systems: MARDUK at 61.151 is a simh emulated pdp11/93 running RSTS/E v9.6 with DECnet. ENKIDU at 61.152 is a simh emulated VAX running OpenVMS 7.3 with DECnet and IP. This is in addition to GLGMSH (Gilgamesh) at 61.150, the KLH10 TOPS-20 system I've been running for many years. All are located in San Jose, CA. Johnny, if you could add my two new systems to the nodedb, I would appreciate it. And to Dave M., these will be pretty low volume net usage, so impact on your link should be minimal to unnoticeable.