Reparameterize bequest motive #27
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Bequest motive now uses BeqMPC and BeqInt rather than BeqFac and BeqShift. Gets interpretable results.
Also fixed an error with default choice.
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This implements the re-parameterization of the bequest motive from (BeqFac, BeqShift) to (BeqMPC, BeqInt). The mapping is:
BeqMPC = BeqFac^(-1/CRRA) ... BeqInt = BeqShift * BeqMPC
The inverse of that mapping is applied in the WarmGlow specifications of this estimation, because the AgentType subclass still uses BeqFac and BeqShift. I have verified that do_all.py works as intended after the changes.