Release v3.11.4

Document the NLPPlus Interface analyzer template on the "Calling Analyzers from Python & Node.js" help page.

When creating a new analyzer, choosing the NLPPlus Interface template gives an analyzer already pre-wired for the two-way NLPPlus package exchange:

• the json2kbb pass is already in the sequence before the tokenizer (imports JSON handed in via put_json_*), and
• an output pass already writes output.json for the package to read back via results.output.

Users can start from this template instead of adding the json2kbb pass and JSON export by hand.

PR #195 (follow-up to #194).