To better support IntlCalendar, added this function:
string IntlDateFormatter::formatObject(IntlCalendar|DateTime $obj [,
array|int|string $format = null [, string $locale = null).
$format is either of the constants IntlDateFormatter::FULL, etc., in
which case this format applies to both the date and the time, an array
in the form array($dateFormat, $timeFormat), or a string with the
SimpleDateFormat pattern.
This uses both the Calendar type and the timezone of the passed object
to configure the formatter (a GregorianCalendar is forced for
DateTime).
Some stuff was moved around and slighlt modified to allow for more code
reuse.
