#1276, #1278, #1279, #1280 False positive in UnusedPrivateMethod
Make the auxclasspath option optional. Falls back to the old behavior,
which prevents many false positives.
But it introduces the false negative case #1226, if no auxclasspath is set.
#1276 False positive in UnusedPrivateMethod with inner enum
verify #1280 False Positive in UnusedImports when import used in javadoc
#1281 UnusedPrivateMethod incorrectly flagged for methods nested private classes
#1282 False Positive with implicit String.valuesOf() (Java)