Cleaned up interface. openFile() must be called before getting metadata,
results, or geometry. Running unit tests for only one reader instance
for the test file.
Reporting nodal, element nodal, and integration point result names
separately. Some functions in the geo mech interface were renamed.
Renamed "result" to "field" in function and parameter names in the
interface. TODO: Consider if we should report integration point results
as element node results too, and extrapolate when requested, if needed.
Fixed map handling in RifOdbReader::componentIndex().
