Improvements to javac diagnostics (not an RFR yet)

[Eric McCorkle]

This webrev has a set of changes to javac diagnostic messages to improve
their readability and coherence with the JLS.

Please look over them and make any suggestions for additional changes.

Note that this is not a formal review request, and there are probably
tests that will fail due to these changes.

The webrev is here:
http://cr.openjdk.java.net/~emc/8019461/
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