This is an umbrella RFE for a package of the following changes:

        4125581: javadoc tool: Make doclet components (not) be serializable
        4208989: javadoc tool and API: Provide more information with warnings
        4192783: Doclet API: expose file/line/column of declarations.
        4232882: javadoc tool: If omitting *, want to keep indentation within <PRE> code examples
        4422788: javadoc API: provide access to the value of constant fields
        4180839: Allow serialized form to be generated in normal run of Javadoc
        4165985: javadoc tool: Use BreakIterator to determine end of first sentence
        4074234: Traverse/recurse all subpackages with "javadoc <packagename>"