8081347: Add @modules to jdk_core tests
Reviewed-by: alanb, joehw, lancea
Contributed-by: alexander.kulyakhtin@oracle.com, alan.bateman@oracle.com, mandy.chung@oracle.com

6943119: Rebrand source copyright notices
Reviewed-by: darcy, weijun

6843578: Re-implement IBM doublebyte charsets
6639450: IBM949C encoder modifies state of IBM949 encoder
6569191: Cp943 io converter returns U+0000 and U+FFFD for unconvertable character
6577466: Character encoder IBM970 throws a BufferOverflowException
5065777: CharsetEncoder canEncode() methods often incorrectly return false
Summary: Re-write 11 IBM doublebyte charsets. Thanks Ulf.Zibis for the codereview!
Reviewed-by: martin

6843079: Putback for the new EUC_TW is not complete
Summary: Putback the files missed in last putback
Reviewed-by: alanb