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Fix/distance/correlation (#864)

* -

* • ControlSignal
  - cost_option argument:  default changed to None
  - _update:  only call _compute_costs if cost_options != None

• EVCControlMechanism
  - _instantiate_control_signal:  override added to set
       cost_options to ControlSignalCosts.DEFAULT by default

* • Function
  Distance:
  - fixed correlation calculation and changed to 1-corr
  - deleted Pearson
  - docstring revs accordingly

* • Function
  Distance:
  - fixed correlation calculation and changed to 1-corr
  - deleted Pearson
  - docstring revs accordingly

* • Function
  Distance:
  - fixed correlation calculation and changed to 1-corr
  - deleted Pearson
  - docstring revs accordingly

* Merge branches 'devel' and 'fix/distance/correlation' of https://github.com/PrincetonUniversity/PsyNeuLink into fix/distance/correlation

# Conflicts:
#	psyneulink/library/mechanisms/processing/transfer/contrastivehebbianmechanism.py
#	psyneulink/library/mechanisms/processing/transfer/recurrenttransfermechanism.py

* • Function
  Distance:
  - fixed correlation calculation and changed to 1-corr
  - deleted Pearson
  - docstring revs accordingly

• tests/functions/test_distance
  - fixed

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