Summary: to use new InternalError constructor with cause chainning
Reviewed-by: alanb, ksrini, xuelei, neugens
Contributed-by: sebastian.sickelmann@gmx.de

6955047: (tz) javadoc for TimeZone.getDisplayName(boolean daylight, int style, Locale locale) is not clear
7021680: (tz) daylight savings time should be daylight saving time
Reviewed-by: peytoia

Reviewed-by: peytoia

6560965: [Fmt-Da] defaultCenturyStart In SimpleDateFormat should be protected
6560980: [Fmt-Da] DateFormatSymbols.cacheLookup doesn't update cache correctly.
Reviewed-by: naoto, peytoia

6638110: (tz) TimeZone.getDisplayName(...) spec is inconsistent with implementation for unavailable locales
Reviewed-by: peytoia

Reviewed-by: okutsu

Reviewed-by: darcy, weijun