8175000: jexec fails to execute simple helloworld.jar
Reviewed-by: ksrini, henryjen, stuefe

8156478: 3 Buffer overrun defect groups in jexec.c
Reviewed-by: ksrini

8074579: Use more efficient and readable way of checking PKZIP signatures
Reviewed-by: sherman

8054834: Modular Source Code
Reviewed-by: alanb, chegar, ihse, mduigou
Contributed-by: alan.bateman@oracle.com, alex.buckley@oracle.com, chris.hegarty@oracle.com, erik.joelsson@oracle.com, jonathan.gibbons@oracle.com, karen.kinnear@oracle.com, magnus.ihse.bursie@oracle.com, mandy.chung@oracle.com, mark.reinhold@oracle.com, paul.sandoz@oracle.com