Changed SongCriteria.m_sGroupName to a vector m_vsGroupNames, to allow for the potential to select a song from more than one group.

src/CourseUtil.cpp

@@ -255,7 +255,7 @@ void CourseUtil::AutogenEndlessFromGroup( const RString &sGroupName, Difficulty
 	// gameplay. (We might still get a repeat at the repeat boundary,
 	// but that'd be rare.) -glenn
 	CourseEntry e;
-	e.songCriteria.m_sGroupName = sGroupName;
+	e.songCriteria.m_vsGroupNames.push_back(sGroupName);
 	e.stepsCriteria.m_difficulty = diff;
 	e.bSecret = true;