OPENNLP-1539 - Introduce parameter for POSTaggerME to configure output POS tag format

[rzo1]

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Note:

This is a Draft open for feedback on implementing compatibility with older PENN-based POS models from Sourceforge.

However, it is ready for review / ideas and comments / thoughts.

[rzo1]

Note: The currently failing tests are unrelated to the actual change:

Error:    ChunkerModelLoaderTest.initResources:43->lambda$initResources$0:47 Runtime java.io.IOException: Server returned HTTP response code: 503 for URL: https://opennlp.sourceforge.net/models-1.5/en-chunker.bin
Error:    TokenNameFinderModelLoaderTest.initResources:43->lambda$initResources$0:47 Runtime java.io.IOException: Server returned HTTP response code: 503 for URL: https://opennlp.sourceforge.net/models-1.5/en-ner-location.bin
Error:    TokenNameFinderModelTest.testNERWithPOSModelV15:122->AbstractModelLoaderTest.downloadVersion15Model:41->AbstractModelLoaderTest.downloadModel:57 » IO Server returned HTTP response code: 503 for URL: https://opennlp.sourceforge.net/models-1.5/pt-pos-perceptron.bin

[jzonthemtn]

@rzo1 Did you run into any weirdness with the older Sourceforge models?

[rzo1]

Need to add an test for it ;-)

[mawiesne]

Thx @rzo1 - I left some comments to improve clarity of the doc for the changes in the API.

[rzo1]

@rzo1 Did you run into any weirdness with the older Sourceforge models?

Added tests. They look good.