Cosmetic. Added missing license header.
Cosmetic - added missing license comment.
Added the new transreal comparison operators. Also a refactoring to base toktype.xdef on the keyword strings. In addition I had to remove the KW_ALT_APPEND (which was "<>") as it clashed with the transreal comparator "<>". Note that "><" is unavailable because of the "non-stick" rule to support element syntax.