Renamed KoralRelation to KoralTermGroupRelation.

Change-Id: I3040ef88e17a1570e9bfe641fe17b08f209d5af0
diff --git a/src/main/java/de/ids_mannheim/korap/query/object/KoralRelation.java b/src/main/java/de/ids_mannheim/korap/query/object/KoralTermGroupRelation.java
similarity index 100%
rename from src/main/java/de/ids_mannheim/korap/query/object/KoralRelation.java
rename to src/main/java/de/ids_mannheim/korap/query/object/KoralTermGroupRelation.java