* add cmake files to find (optional) supported libraries

* add unit tests for sparse cholesky

cmake/FindUmfpack.cmake

@@ -0,0 +1,46 @@
+
+if (UMFPACK_INCLUDES AND UMFPACK_LIBRARIES)
+  set(UMFPACK_FIND_QUIETLY TRUE)
+endif (UMFPACK_INCLUDES AND UMFPACK_LIBRARIES)
+
+find_path(UMFPACK_INCLUDES
+  NAMES
+  umfpack.h
+  PATHS
+  $ENV{UMFPACKDIR}
+  ${INCLUDE_INSTALL_DIR}
+  PATH_SUFFIXES
+  suitesparse
+)
+
+find_library(UMFPACK_LIBRARIES umfpack PATHS $ENV{UMFPACKDIR} ${LIB_INSTALL_DIR})
+
+if(UMFPACK_LIBRARIES)
+
+  get_filename_component(UMFPACK_LIBDIR ${UMFPACK_LIBRARIES} PATH)
+
+  find_library(AMD_LIBRARY amd PATHS ${UMFPACK_LIBDIR} $ENV{UMFPACKDIR} ${LIB_INSTALL_DIR})
+  if (AMD_LIBRARY)
+    set(UMFPACK_LIBRARIES ${UMFPACK_LIBRARIES} ${AMD_LIBRARY})
+  else (AMD_LIBRARY)
+    set(UMFPACK_LIBRARIES FALSE)
+  endif (AMD_LIBRARY)
+
+endif(UMFPACK_LIBRARIES)
+
+if(UMFPACK_LIBRARIES)
+
+  find_library(COLAMD_LIBRARY colamd PATHS ${UMFPACK_LIBDIR} $ENV{UMFPACKDIR} ${LIB_INSTALL_DIR})
+  if (COLAMD_LIBRARY)
+    set(UMFPACK_LIBRARIES ${UMFPACK_LIBRARIES} ${COLAMD_LIBRARY})
+  else (COLAMD_LIBRARY)
+    set(UMFPACK_LIBRARIES FALSE)
+  endif (COLAMD_LIBRARY)
+
+endif(UMFPACK_LIBRARIES)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(UMFPACK DEFAULT_MSG
+                                  UMFPACK_INCLUDES UMFPACK_LIBRARIES)
+
+mark_as_advanced(UMFPACK_INCLUDES UMFPACK_LIBRARIES AMD_LIBRARY COLAMD_LIBRARY)