pedsnet-etlprov miscellaneous

[murphyke]

Some issues to consider. I wouldn't mind working on some of the etlprov issues, although it would probably have to be in a couple weeks.

• Update to latest service URL
• Support case-insensitive entities - some sites are inclined to use upper-case, which is not unreasonable
• When using model and version defaults, the tool reports > error decoding model: invalid character '<' looking for beginning of value
• Lots of people want to be able to use 'None' to represent an empty previous step
• In tools.csv and sources.csv, people would like to be able to say 'All' for Steps
• If a table is referred to in steps.csv, it is converted into all the individual fields in the table, and if those individual fields don't exist in entities.csv, an error is raised - this is confusing; probably the entities check should be made only on entities.csv
• If either model or version is wrong, you get "service http://data-models.origins.link responded with status code 404". It would be better to catch that error, then test the model and version separately and report the actual error.
• It is mildly annoying that you can do '-version 2.1.0' but you cannot do '-truncate false'.
• Maybe have a -list-models option to list all models and versions.