An update on the FHIR work.

There are two issues that I'm trying to address:

1) A better interface for the tryton data models. Since there seems considerable interest in data from multiple sources -- devices, telemed, etc. -- we need a better common interface for the tryton data models.

2) Deprecating our fhir library(s). We don't have the resources (or desire) to maintain libraries against evolving standards. Furthermore, there are, finally, good 3rd-party libraries for fhir - seems an easy choice to me. Hehe.

The fhir server, currently, is mostly proof-of-concept code, rather than actually well designed. I probably should have spent some more designing, rather than jumping into the fhir standards, etc. Easy to see in hindsight, I suppose. Anyways, here are the goals:

- Write adapter classes for the data models.
    - This should be a general interface to the models using fhir-like resources.
    - I'm mostly separating code out from other classes, and updating it for the new standard.
        e.g., fhir-like data <---> ADAPTER <---> gnuhealth.patient

- Move as much code to the 3rd party fhir library.
    - Mostly this means removing a lot of code, and writing glue code.
        e.g., 3rd party fhir library <---> GLUE CODE <---> fhir-like data <---> adapter

The adapter classes are there as a general interface, not only for the fhir server. For example, handling device input to update a patient's current weight. However, currently, they don't work well separated from the fhir server, so I need to separate out the relevant code. The glue code will be tedious but hopefully I can adapt previous code.

Since I don't want to pollute the main repo, I'm using a github repo (for now): https://github.com/teffalump/fhir. Once I get reasonable stability and function, I'll merge the new code back into the main repo, host it separately, etc.

-C