"nmos" is a three-terminal NFET representation. The bulk node is
initially set to "gnd!" but is modifiable from the property list. If you
want a four-terminal NFET, use "nmos4".

This version netlists to a bidirectional device (rtranif1) when
simulated using Verilog. It has also been modified to include 0.1
units of delay when simulated using Verilog.
