More assertion fixes

[Mike Madore <mmadore@xxxxxxxxxxxxxxxxxxx>]

Hi,

I added some more validity checks to orders and commands to the code 
in CVS.  The emulator should now be able to better handle display streams
which binary or garbage data.  For Scott Klement's test program at least,
the behavior is now pretty much like a real IBM terminal.

Since some of the commands and orders are not fully implemented (or
implemented at all in the case of write display structured field), the
validity checking is also incomplete.

Let me know how this works for you.  If you get any assertions or other
odd behavior, post an e-mail and send me a trace file.

Thanks

Mike

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