First steps to convert MARC schema to Avram format

[nichtich]

Partly resolves #370 by simple modification of the format as listed at timathom/marc-schema#1:

• wrap the list of fields in a root object with key 'fields' and add key family with value 'marc'
• rename key 'name' to 'label'
• rename key 'values' to 'codes'
• rename key 'staticValues' to 'positions'
• remove key 'fixed', its value is implied by non-existence of 'subfields'

[pkiraly]

@nichtich Sorry I just reviewed this PR. I would like to keep both versions and your versions of the class and the schema. Why? Because the maintainer of this schema is @timathom and he might have an existing infrastructure which supports his naming conventions, while it is equally important that there should be an Avram compatible version. So my suggestion: name your Marc21SchemaReader.java to AvramMarc21SchemaReader.java, and I will rename the old one to something like YaleMarc21SchemaReader. For the same reason I will rename the existing schema authority-schema.yale.json, and you should rename yours to authority-schema.avram.json. Do you agree?

[pkiraly]

@nichtich I have just modified the existing files, so you can rename your versions.

[timathom]

Thanks for your consideration, @pkiraly, but there's no need to maintain the naming conventions I used. I haven't yet built anything that depends on them, so, I'm more than happy to align with Avram!

[pkiraly]

@timathom Thanks for the clarification!
@nichtich You do not need any further action yet. I'll do the modifications.

[pkiraly]

I fixed the conflicts, now both schema versions and both handlers are available in the code base.

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