Introduce FileShapeStore

[Jan-Oliver Wagner]

Hi,

attached is a patch that introduces the class FileShapeStore.
This holds anything you need for specifiying the store
for a loader routine.

The Thuban internal ShapefileStore is now derived from it.

I also have a working modification of the ogr extension
where I have a OGRFileShapeStore and where I can load
(so far only) shapefiles via OGR and save correct .thuban
files.


This patch is only the first step. As Nina wrote in her
email on March 1st, we need a concept to let Extension
communicate their abilities and to consider this in the
load routine. This will be tackled next.


Any comment on my patch or should I commit?

	Jan

-- 
Jan-Oliver Wagner               http://intevation.de/~jan/

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