Pull request

-Clarified and simplified Transaction javadoc. Please review, be
brutal. reject if not satisfied.
-Fixed my own mistake of accidentally loosening of "Serializable"
requirement from createPrevayler methods.
-Javadoc type @params to explain "P" and "R" on the front-end classes
-Fixed some of my own previous javadoc wording and presentation mistakes
-Other javadoc neatness things.
-Fixed my own mistake of naming direct transaction variable just
"_transaction", renamed it to more appropriate "_directTransaction".

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