OpenLayers WFS client doesn't recognize OMSF features

[tazle]

It seems that OpenLayers WFS client only supports WFS 1.0 and 1.1. The test endpoint for OMSF only supports WFS 2.0.

The GML parser in OpenLayers also didn't recognize plain OMSF TimeseriesObservation. It is unclear how much work it would be to add a) specific support for OMSF, possibly as a plugin, or b) enough schema support for OMSF to work out-of-the-box. The latter would probably be mroe work, considering the 20000-line GML support files in GeoTools.