Initial import of tkgate version 0.9.

A Tcl/Tk based digital circuit editor and simulator.

PR:		11917
Submitted by:	Jeffery Hansen <hansen@cmu.edu>

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+TkGate is a digital circuit editor and simulator with a Tcl/Tk based
+interface.  TkGate includes a large number of built-in devices
+including basic gates, memories, ttys and modules for hierarchical
+design.  The simulator can be controlled either interactively or
+through a simulation script.  Memory contents can be loaded from
+files, and a microcode/macrocode compiler (gmac) is included to create
+tkgate memory files from a high-level description.  The simulator
+supports continous simulation, single step simulation (by clock or
+epoch) and breakpoints.  Save files are in a Verilog-like format.
+
+TkGate also includes a number of tutorial and example circuits which
+can be loaded through the "Help" menu.  The examples range from a
+simple gate-level 3-bit adder to a 16-bit CPU programmed to play the
+"Animals" game.
+
+For more information on TkGate, see the TkGate web site at:
+
+WWW: http://www.cs.cmu.edu/~hansen/tkgate
+
+Program and FreeBSD port by: 
+  Jeffery Hansen <hansen@cmu.edu>
+  http://www.cs.cmu.edu/~hansen