Merge jdk7-b31

Merge

6507179: javadoc -source 1.3 does not work with jdk6

6294779: Problem with interface inheritance and covariant return types

6716866: some javac regression tests fail to compile with re-orged file manager

6714365: refactor JavacFileManager to move nested classes to top level

6625520: javac handles missing entries on classpath badly

Added tag jdk7-b30 for changeset eaf608c64fec

6719955: Update copyright year jdk7-b30

Merge

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