Remove active fields from nodes#13

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glesica wants to merge 15 commits into

remove_active_fields

Commits on Jun 5, 2015

Removed deepcopy() from function mutate in Mutate.jl and from function mu_lambda in Evolution.jl.
ahalwright
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Commits on Jun 10, 2015

Wrote NodeCache.jl and ChromosomeCache.jl to implement a data structure parallel to Chromosome which can
ahalwright
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Modified the Chromosome type to add the fields "has_cache" and "cache".
ahalwright
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