make emissions analysis classes public

contribs/emissions/src/main/java/org/matsim/contrib/emissions/analysis/EmissionsByPollutant.java

@@ -31,7 +31,7 @@
  * Sums up emissions by pollutant. Basically wraps a hash map but is here for better
  * readability of {@link org.matsim.contrib.emissions.analysis.EmissionsOnLinkEventHandler}
  */
-class EmissionsByPollutant {
+public class EmissionsByPollutant {
     // The EmissionsByPollutant potentially adds up the same emissions coming from cold and warm.  Thus, this cannot be combined into the enum approach
     // without some thinking.  kai, jan'20
     // yyyy todo I think that this now can be done.  kai, jan'20

contribs/emissions/src/main/java/org/matsim/contrib/emissions/analysis/EmissionsOnLinkEventHandler.java

@@ -36,7 +36,7 @@
 /**
  * Collects Warm- and Cold-Emission-Events by time bin and by link-id
  */
-class EmissionsOnLinkEventHandler implements WarmEmissionEventHandler, ColdEmissionEventHandler {
+public class EmissionsOnLinkEventHandler implements WarmEmissionEventHandler, ColdEmissionEventHandler {
 
     private final TimeBinMap<Map<Id<Link>, EmissionsByPollutant>> timeBins;