* Created branch devel-landr for digital landascape representation developments
* Added functionalities for shapefile handlings from GeoVectorValue
* Added minimum for opening a raster file from GeoRasterValue
* Put back GeoVectorValue tests
* Created minimal landr library structure
* Fixed cyclic dependency in GeoVectorValue test
* Removed openfluid::landr references from openfluid::core
* Added new GeoVectorValue tests
* Added first landr structures for LineStrings management
* Added properties attribute to LineStringUnit
* Added macros for looping on a LineStringGraph
* Added getLength function
* Renamed LineStringUnit to LineStringEntity
* Added graph of polygons creation and basic management
* Added ability to insert "horseshoe-shaped" Polygons in PolygonGraph
* Added check of Polygon validity before inserting in PolygonGraph
* Improved management of PolygonEntities neighbours
* Added functions for GeoRaster manipulation
* Added distance between two Polygon centroides computation
* Added basic raster/vector interaction functions
* Added raster polygonization
* Added ability to get the raster pixels overlapping a polygon, with their associated values and areas.
* Speeded up PolygonGraph creation
* Forbidden PolygonGraph creation with non-valid Polygon
* Cleaned code, removed glibmm dependency
* Fixed bug in PolygonGraph when a resulting overlap geometry between raster/vector is a multipolygon
* Merged from trunk rev. 1699