8149146: [javadoc] eliminate doclet.xml
Reviewed-by: ksrini, bpatel

8177848: Rename Configuration(Impl) classes
Reviewed-by: jjg

8177567: cache VisibleMemberMap
Reviewed-by: jjg

8167967: javadoc should identify the ordinal value of enum constants
Reviewed-by: jjg

8164130: Simplify doclet IOException handling
Reviewed-by: bpatel, ksrini

8035473: [javadoc] Revamp the existing Doclet APIs
8146529: Update the new Doclet API
8146427: "-nohelp" option issue
8146475: "-helpfile" option issue
Reviewed-by: alanb, bpatel, ihse, jjg, jlahoda, mchung, ogb, vromero