Resolve issues adversely affecting test suites.

- CITE-937: Service proxy is bypassed (wms-client).
- CITE-924: EPSG database is not created in web app context (ets-gml-3.2.1, ets-wfs-2.0).
- Reintroduce default site content in web app.
- Update documentation and module POMs for GitHub hosting.
Add modified files to resolve CITE-937, CITE-924.
Update version and release notes for next release (4.0.5).