correct format for date, time, timestamp for XML functionality

Hello,

this patch ensures independency datetime fields on current datestyle
setting. Add new internal datestyle USE_XSD_DATESTYLE. It's almoust same to
USE_ISO_DATESTYLE. Differences are for timestamp:

ISO: yyyy-mm-dd hh24:mi:ss
XSD: yyyy-mm-ddThh24:mi:ss

I found one link about this topic:
http://forums.oracle.com/forums/thread.jspa?threadID=467278&tstart=0

Regards
Pavel Stehule

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