8151220: Extend sample API to use modules.
Reviewed-by: ksrini

8157975: Remove duplicate files in sample API
Reviewed-by: jjg, ksrini
Contributed-by: alexandre.iline@oracle.com

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