Use cropharvest.BANDS_MAX to normalize values in the train script

[gabrieltseng]

Second attempt at #28

[ivanzvonkov]

Could you regenerate each of the train.py's by using

cd buildings-example
openmapflow generate

And regenerating only the train.py

[gabrieltseng]

Could you regenerate each of the train.py's by using

cd buildings-example
openmapflow generate

And regenerating only the train.py

Updated!

[ivanzvonkov]

@gabrieltseng thanks! Could you do the regeneration for the other two examples also buildings-example and maize-example?

[gabrieltseng]

I think they are all regenerated? It should all be in this commit: b8bcbc4

[ivanzvonkov]

Apologies, for some reason I did not see all of them earlier! Looks good, feel free to merge!