Destroy the old tree legend before creating new ones
Fix OverlayLayerContainer to exclude displayInLayerSwitcher:false
Make the overlay fix more readable
Merge pull request #194 from juliensam/186-wmslegend

Fix for #186 - Manual garbage collection for gx_wmslegend
Add four currently failing FeatureStore tests.

These tests are modelled after the contents of the `grid/feature-grid.html`
example, which shows wrong syncing between layer features and store records
if one either adds manually a record to the store or a feature to the layer
with code like this issued in the console:

    mapPanel.map.layers[1].addFeatures([
        new OpenLayers.Feature.Vector(
            new OpenLayers.Geometry.Point(5,45)
        )
    ]);

The layer would afterwards only have one feature, but the store would still
have the initial 10 records.

Adding a record manually (e.g. with `store.add()`) will also show the wrong
behaviour.
Use store.add() not loadRawData() onFeatureAdded.

This fixes the asynchronous behaviour of store and layer which can
be observed when manually adding features to the layer or records to
the store.

The test `test_addFeaturesAddRecord(t)` now passes.
Merge pull request #196 from marcjansen/feat-store

FeatureStore: Use store.add() not loadRawData() onFeatureAdded.
Various documentation improvements.

Also removes some dead or obviously unecessary code.
Merge pull request #197 from marcjansen/even-more-docs

Various documentation improvements.
Set `GeoExt.version` to `2.0.0-rc.1`.
API-doc formatting.
Fix a few typos in the documentation.
Merge pull request #198 from jomue/doc-improvements

Fix a few typos in the documentation.
API docs for code example improved.
Fix API docs.
Change copyright to 2013.
Merge pull request #199 from marcjansen/2013

Change copyright to 2013.