rename the tests/grids folder to tests/data

... since the "grids" in that folder are slowly accumulating
information. (e.g. the ART grid for the fracture mapper and ECLIPSE
decks in the future.)

tests/problems/eclproblem.hh

@@ -137,7 +137,7 @@ SET_BOOL_PROP(EclBaseProblem, EnableVtkOutput, false);
 SET_BOOL_PROP(EclBaseProblem, EnableEclipseOutput, true);
 
 // The default DGF file to load
-SET_STRING_PROP(EclBaseProblem, GridFile, "grids/ecl.DATA");
+SET_STRING_PROP(EclBaseProblem, GridFile, "data/ecl.DATA");
 }} // namespace Properties, Opm
 
 namespace Ewoms {