UCUMFormat might not identify Prefixes when inspecting UnitConverters

[andi-huber]

These tests are supposed to succeed:

@Test
public void testKiloGram() {
	Unit<Mass> m1 = KILO(GRAM);
	assertEquals("kg", FORMAT_PRINT.format(m1));
}

@Test
public void testMegaGram() {
	Unit<Mass> m1 = MEGA(GRAM);
	assertEquals("t", FORMAT_PRINT.format(TONNE));
	assertEquals("Mg", FORMAT_PRINT.format(m1));
}

@Test
public void testMegaTonne() {
	Unit<Mass> m1 = MEGA(TONNE);
	assertEquals("Mt", FORMAT_PRINT.format(m1));
}

@Test
public void testNanoGram() {
	Unit<Mass> m1 = NANO(GRAM);
	assertEquals("ng", FORMAT_PRINT.format(m1));
}

[keilw]

Thanks, if no other big issues come up, we may be able to release 2.0 in the course of this week.