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

Samo Penic

2016-07-05 8c91d2bcad7df7c647f1379483673183329ddfe8

 configure.ac

@@ -51,6 +51,5 @@
AC_CHECK_FUNCS([pow sqrt strndup])

AC_CONFIG_FILES([Makefile
                 src/Makefile
                 test/Makefile])
                 src/Makefile])
AC_OUTPUT