Fixed some bugs in cluster.c, added a line in cluster.h

Samo Penic

2016-07-05 8c91d2bcad7df7c647f1379483673183329ddfe8

 src/general.h

@@ -284,6 +284,9 @@
   long int mcsweeps;
   long int quiet;
   long int shc;
   long int number_of_vertices_with_c0;
   ts_double c0;
   ts_double w;
} ts_tape;