Add limits to Vizier input parameters.

Imposed provisional upper and lower limits to each parameter
that can be adjusted in the Vizier ML experiment.

Also in some cases applied secondary limits on on the
range of the final "used" values.

Defaults and limits may well require further tuning after
subsequent rounds of experimentation.

Re-factor get_sr_decay_rate().

Change-Id: I28e804ce3d3710f30cd51a203348e4ab23ef06c0
2 files changed