Merge jdk7-b62

Merge

6838199: remove support for old javap

6802102: unignore @ignored tests where possible

6843761: Update langtools tests to remove unncessary -source and -target options

6722234: javac diagnostics need better integration with the type-system

6843648: tools/javac/versions/check.sh is broken

6827026: Change javac source and target default to 7

6832154: refactor Paths to be just a utility class for JavacFileManager

6843013: missing files in fix for 6824493

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