8072054: Cannot build langtools if checked-out in a directory ending with \"com\"
Summary: Making sure a proper package name is used when generating Properties classes
Reviewed-by: mcimadamore

8069229: new .java file with no copyright notice
Summary: Add missing copyright header
Reviewed-by: jlahoda

8058542: Devise scheme for better diagnostic creation
Summary: Add support for generating (at build-time) an enum-like class containing all javac diagnostics, which allows for safe diagnostic creation.
Reviewed-by: jlahoda, jjg, vromero, erikj, jfranck