Support for SQL type transformation methods

[jenetics]

Allow a simple way for converting data types to its corresponding SQL types, and vice versa.

static <T, U, V> Field<T> Dctor.field(
	final String name,
	final SqlFunction<? super T, ? extends U> value,
	final Function<? super U, ? extends V> f
) {
	return field(name, (record, conn) -> f.apply(value.apply(record)));
}

[jenetics]

Merged into r1.2.0 branch.