Updated tutorials after Orekit API change.

src/main/java/org/orekit/tutorials/propagation/CovariancePropagation.java

@@ -152,7 +152,7 @@ public class CovariancePropagation {
         // Set up covariance matrix provider and add it to the propagator
         final StateCovarianceMatrixProvider provider = new StateCovarianceMatrixProvider("covariance", stmAdditionalName,
                                                                                          harvester, covInit);
-        propagator.addAdditionalStateProvider(provider);
+        propagator.addAdditionalDataProvider(provider);
 
         // Perform propagation
         final AbsoluteDate targetEpoch = stateInit.getDate().shiftedBy(Constants.JULIAN_DAY);

src/main/java/org/orekit/tutorials/propagation/DSSTPropagation.java

@@ -710,7 +710,7 @@ public class DSSTPropagation {
                     if (shortPeriodCoefficients.isEmpty()) {
                         // we want all available coefficients,
                         // they correspond to the additional states
-                        for (final DoubleArrayDictionary.Entry entry : s.getAdditionalStatesValues().getData()) {
+                        for (final DoubleArrayDictionary.Entry entry : s.getAdditionalDataValues().toDoubleDictionary().getData()) {
                             shortPeriodCoefficients.add(entry.getKey());
                         }
                         Collections.sort(shortPeriodCoefficients);