RFC - DDB relops,logical ops,bitwise ops

[dan_partelly]

Hi all,

I attach a patch for comments (the patch is not final is intended for
comments only, format for one thing is messed ) 
regarding support for !=, ==, <, >, >=, <= , ! , ~, & , | , && , ||
operators in DDB expressions.

The code was mainly pulled from Mach 3.0 kernel with a couple of bug-fixes
 I added them in my copy mainly
because I am interested in crafting conditional breakpoints later. (and
some other DDB usability enhancements).
Please share your opinions. 

Regards!
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