Provide CMake find module for opm-autodiff

If the module root is not explicitly specified, the loading of its
configuration is delegated to a find module, which does a heuristic
search in known/surrounding directories. Most OPM modules use the
common logic in OpmPackage; this patch configures the search
specifically for opm-autodiff.

cmake/Modules/Findopm-autodiff.cmake

@@ -0,0 +1,44 @@
+# - Find OPM automatic differentiation library
+#
+# Defines the following variables:
+#   opm-autodiff_INCLUDE_DIRS    Directory of header files
+#   opm-autodiff_LIBRARIES       Directory of shared object files
+#   opm-autodiff_DEFINITIONS     Defines that must be set to compile
+#   opm-autodiff_CONFIG_VARS     List of defines that should be in config.h
+#   HAVE_OPM_AUTODIFF            Binary value to use in config.h
+
+# Copyright (C) 2012 Uni Research AS
+# This code is licensed under The GNU General Public License v3.0
+
+# use the generic find routine
+include (opm-autodiff-prereqs)
+include (OpmPackage)
+find_opm_package (
+  # module name
+  "opm-autodiff"
+
+  # dependencies
+  "${opm-autodiff_DEPS}"
+  
+  # header to search for
+  "opm/autodiff/AutoDiff.hpp"
+
+  # library to search for
+  "opmautodiff"
+
+  # defines to be added to compilations
+  ""
+
+  # test program
+"#include <opm/autodiff/AutoDiff.hpp>
+int main (void) {
+  Opm::AutoDiff<double> x = Opm::AutoDiff<double>::constant(42.);
+  (void) x;
+  return 0;  
+}
+"
+  # config variables
+  "${opm-autodiff_CONFIG_VAR}"
+  )
+include (UseDynamicBoost)
+#debug_find_vars ("opm-autodiff")