Merge branch 'feature/ex-2-less-entities' into 'master'

[ex2] use less entities to speed up mesh generation

See merge request DennisGlaeser/frackit!56

appl/example2/example2.cc

@@ -70,8 +70,8 @@ int main()
     const Id idSet2(2);
 
     SamplingStatus status;
-    status.setTargetCount(idSet1, 15);
-    status.setTargetCount(idSet2, 15);
+    status.setTargetCount(idSet1, 12);
+    status.setTargetCount(idSet2, 12);
 
     bool sampleIntoSet1 = true;