Report writeBytes errors via java exceptions

[hiddenalpha]

No description provided.

[tresf]

We can avoid changing the method signatures by wrapping the IOException. This will maintain the existing method signatures while providing consistent exception messages to the client.

    /** Exception occurred in native code **/
    final public static String TYPE_NATIVE_EXCEPTION = "Native exception occurred: %s";
    // ...
    public static SerialPortException wrapNativeException(Exception e, SerialPort port, String methodName) {
        return new SerialPortException(port, methodName, String.format(TYPE_NATIVE_EXCEPTION, e.getLocalizedMessage()));
    }

    public boolean writeBytes(byte[] buffer) throws SerialPortException {
        checkPortOpened("writeBytes()");
        boolean success;
        try {
            success = serialInterface.writeBytes(portHandle, buffer);
        } catch(IOException io) {
            throw SerialPortException.wrapNativeException(io, this, "writeBytes");
        }
        return success;
    }

[tresf]

Changes requested per #146 (comment)