Support for upcoming OGC Standard CAT 3.0 in deegree CS-W

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Currently deegree CSW is implementing the OGC standard CSW 2.0.2.
The upcoming version of this standard is 3.0 which should be supported as well.

References:

• CAT 3.0 Spec - http://www.opengeospatial.org/standards/cat
• CAT 3.0 ATS - http://docs.opengeospatial.org/is/14-014r3/14-014r3.html
• CAT 3.0 ETS - https://github.com/opengeospatial/ets-cat30
• ISO 19115-1:2014 - http://www.iso.org/iso/home/store/catalogue_ics/catalogue_detail_ics.htm?csnumber=53798

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OSGeo projects already implementing this standard:

• pycsw 2.0.0, see http://www.opengeospatial.org/resource/products/details/?pid=1374