Update date/time classes in j.util and j.sql packages to interoperate with new JSR310 date/time classes

Following methods are proposed to add into existing jdk date/time classes in j.util and j.sql packages to interoperate with the JSR310 date/time types.

java.util.Date
    public static Date from(Instant instant)
    public Instant toInstant()
java.util.Calendar
    public final Instant toInstant()
java.util.GregoricanCalendar
    public ZonedDateTime toZonedDateTime()
    public static GregorianCalendar from(ZonedDateTime zdt)
java.util.TimeZone
    public static TimeZone getTimeZone(ZoneId zoneid)
java.sql.Date
    public static Date valueOf(LocalDate date)
    public LocalDate toLocalDate()
    public Instant toInstant()
java.sql.Time
    public static Time valueOf(LocalTime time)
    public LocalTime toLocalTime()
    public Instant toInstant()
java.sql.Timestamp
    public static Timestamp valueOf(LocalDateTime dateTime)
    public LocalDateTime toLocalDateTime()
    public static Timestamp from(Instant instant)
    public Instant toInstant()