PCRaster maps

Input PCRaster maps should be readable as REAL4 maps. This implies that any value scale, and all cell representations except REAL8, are allowed as input maps. Output maps are written as REAL4 scalar maps, except for maps resulting from indicator simulation (UINT1 scalar maps). Old PCRaster (version 1) maps are supported when gstat is compiled with CSF_V1 defined, and linked to the version 1 csf library. (Support for version 1 may not be maintained in the future.)