Evaluate ExState usage

[zilinc]

Issue by ahixon
Thu Apr 9 12:44:27 2015
Originally opened as https://github.csiro.au/ts-filesystems/Cogent/issues/72

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Some functions that access the external environment pass it around, others do not. A number of these functions don't actually use them.

[zilinc]

Comment by ahixon
Tue Jun 16 14:58:37 2015

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Would also be interesting to benchmark a version that doesn't pass ExState around, at all (ie implicit environment/heap state). Should definitely be smaller in space; but will it be smaller in time?