* Renamed returnCode to statusCode (as per RFC https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html)
* Expose statusCode to server iface
* API Break: Renamed getHeader() to header() Qt-style
* Split server plugin filter tests in its own test file
* Added tests for clearBody() and body() getter
- Add server exception base class
- Enable per service exception definition
- Handle QgsException gracefully (error 500)
- Handle OGC exception versioning
* layerFilterExpression
Return an additional filter, used in
WMS/GetMap, WMS/GetFeatureInfo, WFS/GetFeature to filter the features
* layerFilterSubsetString
Return an additional the subset string (typically SQL) filter.
Faster than the layerFilterExpression but not supported on all the
type of layer
* layerPermissions
Change the rights on the layer per user (known by the plugin)
Concern rights: publish, insert, update, delete.
Mostly used in WFS/Transaction, and the publish in all requests.
* authorizedLayerAttributes
Be able to show some attributes only for a subset of user
Used in: WMS/GetFeatureInfo, WFS/GetFeature
* allowToEdit
Be able to don't allow to edit a particular feature, in our case base
on the Geometry
Used in: WFS/Transaction
* cacheKey
Cache key to used to create the capabilities cache, "" for no cache,
shouldn't contains any "-", default to ""
