ecr 2.1.0
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New Features

* uniform crossover recombinator recUnifCrossover
* parameter log.stats for ecr function (possibility to define fitness statistics to be logged)
* logical log.pop argument for ecr function (should each population be saved in the logger?)
* possibility to store additional stuff in logger via 'extras'
* terminators stopOnEvals and stopOnOptY

ecr 2.0.0
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* First submission of ecr 2 to CRAN.
* Almost everything changed.
