add cmake module for ZOLTAN

also, link it to alugrid if it has been detected.

cmake/Modules/FindZOLTAN.cmake

@@ -0,0 +1,51 @@
+# -*-cmake-*-
+#
+# Try to find the libzoltan graph partioning library
+#
+# Once done, this will define:
+#
+#  ZOLTAN_FOUND        - system has the libzoltan graph partioning library
+#  HAVE_ZOLTAN         - like ZOLTAN_FOUND, but for the inclusion in config.h
+#  ZOLTAN_INCLUDE_DIR  - incude paths to use libzoltan
+#  ZOLTAN_LIBRARIES    - Link these to use libzoltan
+
+set(ZOLTAN_SEARCH_PATH "/usr" "/usr/local" "/opt" "/opt/local")
+set(ZOLTAN_NO_DEFAULT_PATH "")
+if(ZOLTAN_ROOT)
+  set(ZOLTAN_SEARCH_PATH "${ZOLTAN_ROOT}")
+  set(ZOLTAN_NO_DEFAULT_PATH "NO_DEFAULT_PATH")
+endif()
+
+# search for files which implements this module
+find_path (ZOLTAN_INCLUDE_DIRS
+  NAMES "zoltan.h"
+  PATHS ${ZOLTAN_SEARCH_PATH}
+  PATH_SUFFIXES "include" 
+  ${ZOLTAN_NO_DEFAULT_PATH})
+
+# only search in architecture-relevant directory
+if (CMAKE_SIZEOF_VOID_P)
+  math (EXPR _BITS "8 * ${CMAKE_SIZEOF_VOID_P}")
+endif (CMAKE_SIZEOF_VOID_P)
+
+find_library(ZOLTAN_LIBRARIES
+  NAMES "zoltan"
+  PATHS ${ZOLTAN_SEARCH_PATH}
+  PATH_SUFFIXES "lib/.libs" "lib" "lib${_BITS}" "lib/${CMAKE_LIBRARY_ARCHITECTURE}"
+  ${ZOLTAN_NO_DEFAULT_PATH})
+
+set (ZOLTAN_FOUND FALSE)
+if (ZOLTAN_INCLUDE_DIRS OR ZOLTAN_LIBRARIES)
+  set(ZOLTAN_FOUND TRUE)
+  set(HAVE_ZOLTAN 1)
+endif()
+
+set (ZOLTAN_CONFIG_VAR HAVE_ZOLTAN)
+  
+# print a message to indicate status of this package
+include (FindPackageHandleStandardArgs)
+find_package_handle_standard_args(ZOLTAN
+  DEFAULT_MSG
+  ZOLTAN_LIBRARIES
+  ZOLTAN_INCLUDE_DIRS
+  )

cmake/Modules/Finddune-alugrid.cmake

@@ -22,6 +22,7 @@ find_opm_package (
   "CXX11Features REQUIRED;
    dune-grid REQUIRED;
    ZLIB REQUIRED;
+   ZOLTAN;
    METIS
   "
   # header to search for