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Our implementations of SimpleTimeZone and Calendar became mutually recursive
for custom time zones when I changed GregorianCalendar.computeFields to use
TimeZone.inDaylightTime --- SimpleTimeZone's implementation of inDaylightTime
creates a GregorianCalendar leading to a stack overflow looking something
like this...

	at java.util.SimpleTimeZone.inDaylightTime(SimpleTimeZone.java:599)
	at java.util.GregorianCalendar.computeFields(GregorianCalendar.java:595)
	at java.util.Calendar.complete(Calendar.java:819)
	at java.util.Calendar.setTimeInMillis(Calendar.java:1319)
	at java.util.GregorianCalendar.<init>(GregorianCalendar.java:339)
	at java.util.GregorianCalendar.<init>(GregorianCalendar.java:325)
	at java.util.SimpleTimeZone.inDaylightTime(SimpleTimeZone.java:599)

I've cut the knot by introducing "Grego" from ICU4J, and rewriting our
SimpleTimeZone.inDaylightTime in the style of ICU4J's implementation.

Maybe we'll be using the ICU4J calendar implementation sooner than I thought!