Arranged the javac options to output debug information.
Implemented Pid.toString() to be used in String.format().
Fixed SyscallInputStream to manage its status.

InputStream.available() returns zero even when the connection is closed.
So SyscallInputStream must know connection's status.
Fixed to add the last byte of an integer.
Fixed Application to exit with non-zero status in error.
Enhanced logging.
Fixed the version negotiation in the Java version slave hub.
Fixed file descriptors transportation in the slave hub.