uv3 logging: change defaults, add suppress logging from annotators capability

per discussion on dev list:

1) Make UIMA more embeddable by having it able to not have its own back-end for logging.
2) Never-the-less, have the out-of-the-box experience do reasonable logging.
3) Provide a simple, not logging-back-end-specific, way to globally suppress logging from Annotator code.