A new getMeteo() method has been implemented that transparently performs spatial interpolations and returns a grid for a given parameter. This should be prefered to interpolate(), since it allows the reading plugin to directly provide gridded data (such as coming out of GRIB).
Code cleanup in ResamplingAlgorithms, improved error message in A3DIO. Several keys have been updated/added to the plugins, in order to be more consistent between plugins. Therefore, meteo file extensions are given with METEOEXT, grid2d extensions with GRID2DEXT, grid2d prefix with GRID2DPREFIX (not all plugins support them, though), etc