8162546: change hidden options -Xdebug to --debug, -XshouldStop to --should-stop, and -diags to --diags
Reviewed-by: mcimadamore

8161020: javac, fold stop compilation options
Reviewed-by: mcimadamore

8145342: Some copyright notices are inconsistently and ill formatted
Summary: Adjusted formatting of copyright notices.
Reviewed-by: darcy, alundblad

8076543: Add @modules as needed to the langtools tests
Reviewed-by: jjg, shurailine

8005207: test has 2 @bug tags
Reviewed-by: mcimadamore

6943119: Rebrand source copyright notices
Reviewed-by: darcy

6813059: replace use of JavaCompiler.errorCount with shouldContinue
Reviewed-by: mcimadamore