More complete exporter. Batch mode. Slight format improvement. VS Code.

• Now more of OWL can be written in description lists: DisjointClasses, Rules, similar declarations
• Format update makes Datatypes a heading instead of hiding inside :OMN: block. Better for AI assistance.
• The exporter (conversion from existing OWL ontologies) handles property chains
• Scripts available for installing ELOT to run tangle and HTML export in batch mode
• Setup for calling batch mode from VS Code