"cz" (vs ISO langauge code "cs") for Czech analysis package? [LUCENE-6366]

As noted by Eduard Moraru on the solr-user mailing list, the sample fieldtypes Solr provides for dealing with the Czech use "cz" as a fieldType, dynamicField, and stopwords file naming convention – but "cz" isn't the language code for Czech – the correct langauge code is "cs".

Solr's naming convention here comes directly from the lucene analysis package name for the Czech analysis classes: `org.apache.lucene.analysis.cz;` so before making any changes in the Solr sample configs ([SOLR-7267](https://issues.apache.org/jira/browse/SOLR-7267)), we should probably clarify if/why the lucene package name is like this.

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Migrated from [LUCENE-6366](https://issues.apache.org/jira/browse/LUCENE-6366) by Chris M. Hostetter (@hossman), 1 vote, updated Mar 19 2015
Linked issues:
- [SOLR-7267](https://issues.apache.org/jira/browse/SOLR-7267)

Start by reading LUCENE-6366 and the linked SOLR-7267, then inspect the Czech analysis package org.apache.lucene.analysis.cz and the sample Solr fieldType, dynamicField, and stopwords naming mentioned in the issue. Done requires an agreed explanation of why the package uses cz and a clear decision on whether the related Solr naming should change.

Written by the indexing model from the issue text.