changed xml parsing to utilize namespaces

added support to also utilize interpolation methods if provided by GetCapabilities

changes preset setting of GetCapabilities (DatasetSerisSummary and CoverageSummary are not preset anymore)

DecribeCoverage request now also sets the offerd_crs and axisLabels in the GetCoverage Tab

Coverages are not listed in the DescribeEOCoverageSet Tab anymore