Fix typo.
Abort NN if NaNs are observed.
Add method to convert a Request2 into a JsonObject, useful for pretty printing of Job/Model parameters on HTML pages.
Initial work to display stuff on the NNModelView page.
Comment out unused method.
Don't initialize anything in the NNTask constructor that will be modified later.
Improve the logStart() methodology with autogenerated JSON fields.  Modify DRF, GBM, GLM2, NN.