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less more | rev 32: (0) -30 -10 -3 +3 +10 +30 tip

move to more structure mostly working but external vars are lost
Wed, 12 Apr 2017 14:33:47 +0100, by Henry S. Thompson
need to preserve abs ref info
Wed, 12 Apr 2017 11:36:27 +0100, by Henry S. Thompson
tidied dereferencing, added simple (no recursion) coverage for variables in ranges
Tue, 11 Apr 2017 17:03:39 +0100, by Henry S. Thompson

less more | rev 32: (0) -30 -10 -3 +3 +10 +30 tip