[PATCH] Add OGR_L_GetName() / OGRLayer::GetName()

[Even Rouault]

The proposed patch introduces a new virtual method GetName() at the OGRLayer level.

The semantics of this method is to return the same result as GetLayerDefn()->GetName(). This is indeed the default implementation of the OGRLayer class itself.

So, what is it usefull for ? A few drivers, like PG since r20277, can benefit from GetName() by overloading it, without needing to fetch the layer defn, which is an opperation that cost a few SQL requests.

So the new method can be usefull to present the list of layer names of a PG database.

This would also be very handy for a OGR WFS driver I'm writing. It would save a DescribeFeatureType request for each layer. Just GetCapabilities would be needed.

[Even Rouault]

Implemented in trunk in r20336, r20337 and r20338