Fixed spatial filtering for H2/GeoDB

Spatial filtering seems to be broken, if the H2/GeoDB database is used:

```xml
<sos:GetFeatureOfInterest
    xmlns:sos="http://www.opengis.net/sos/2.0"
    xmlns:fes="http://www.opengis.net/fes/2.0"
    xmlns:gml="http://www.opengis.net/gml/3.2"
    service="SOS" version="2.0.0">
    <sos:spatialFilter>
        <fes:BBOX>
            <fes:ValueReference>sams:shape</fes:ValueReference>
            <gml:Envelope srsName="http://www.opengis.net/def/crs/EPSG/0/4326">
                <gml:lowerCorner>0 0</gml:lowerCorner>
                <gml:upperCorner>60 60</gml:upperCorner>
            </gml:Envelope>
        </fes:BBOX>
    </sos:spatialFilter>
</sos:GetFeatureOfInterest>
```

```xml
<ows:ExceptionReport xmlns:ows="http://www.opengis.net/ows/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.0.0" xsi:schemaLocation="http://www.opengis.net/ows/1.1 http://schemas.opengis.net/ows/1.1.0/owsAll.xsd">
  <ows:Exception exceptionCode="NoApplicableCode">
    <ows:ExceptionText>Error while querying features from data source!
[EXCEPTION]: 
Function "ST_WITHIN" not found; SQL statement:
select this_.featureOfInterestId as featureO1_6_0_, this_.featureOfInterestTypeId as featureO3_6_0_, this_.identifier as identifi4_6_0_, this_.codespaceId as codespac5_6_0_, this_.name as name6_6_0_, this_.geom as geom7_6_0_, this_.descriptionXml as descript8_6_0_, this_.url as url9_6_0_, this_.hibernateDiscriminator as hibernat2_6_0_ from featureOfInterest this_ where this_.identifier in (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?) and ( ST_Within(this_.geom, ?)) [90022-172]</ows:ExceptionText>
  </ows:Exception>
</ows:ExceptionReport>
```
We were only creating the `geometry` domain, but `GeoDB.InitGeoDB()` was never called. I had to introduce some new methods in `Datasource`, that are called from the `InstallController` and `SessionFactoryProvider`, because the method has to be called before schema creation and (for the in-memory variant) at every start… Hibernate-spatial doesn't seem to handle that…