Different Structure Macro

[Nathaniel Mishkin <Mishkin at YALE>]

I've written a modified version of DEFINE-STRUCTURE-TYPE called
DEFINE-CSTRUCTURE-TYPE.  The difference is that the names have
":"s instead of "-"s (e.g. rtype-field => rtype:field) and there
is a constructor function which takes positional initializers
(e.g. (rtype:new val1 val2 ...)).

THe compiled version is running on the Apollo.  It is in

	/tools/t/utils/defcstruct.bin

A reasonable structure printer is on the way.

		-- Nat
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