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compute (but not use) master formula cells info,
Tue, 25 Apr 2017 12:24:31 +0100, by Henry S. Thompson
Fixed confusion wrt gen vs. num, nature of @ format (id=49)
Thu, 13 Apr 2017 23:09:58 +0100, by Henry S. Thompson
fix bug in refs wrt e.g. [1]!.SGX,
Wed, 12 Apr 2017 21:35:04 +0100, by Henry S. Thompson
external vars preserved, [0]!... == internal handled, but note that children of ref may not be contiguous by name anymore
Wed, 12 Apr 2017 17:43:54 +0100, by Henry S. Thompson
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

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