Activate (de)serialisation of wms

- URI of streams (wms) is recognized (start with http) StreamSource can be constructed with an URI and it can construct an URI.
- Write a utility tool to split and decode URI query.
- Increment GDMS project version to 2.0.1
- Update XSD of GDMS source list in order to serialize the stream source as an URI.
- Generate JaxB class and edit it (yeark) to fit with non-jaxb method..
- Ows map context manage all exceptions to load other layers.