feat(OrganizationalUnitSubmissionPolicyService): set first submission policy...

feat(OrganizationalUnitSubmissionPolicyService): set first submission policy as default and check that an org unit has a default submission policy

DLCM-Model/src/main/java/ch/dlcm/DLCMMetadataVersion.java

@@ -80,6 +80,10 @@ public enum DLCMMetadataVersion {
     };
   }
 
+  public static boolean isAtLeastVersion(DLCMMetadataVersion versionToSupport, DLCMMetadataVersion versionToCheck) {
+    return versionToCheck != null && versionToCheck.getVersionNumber() >= versionToSupport.getVersionNumber();
+  }
+
   public String getAdministrativeInfoSchema() {
     return PREMIS_3;
   }