Update cmake build to work with cmake-based KIM

cmake/Modules/FindKIM-API-V2.cmake

@@ -0,0 +1,55 @@
+#
+# CDDL HEADER START
+#
+# The contents of this file are subject to the terms of the Common Development
+# and Distribution License Version 1.0 (the "License").
+#
+# You can obtain a copy of the license at
+# http://www.opensource.org/licenses/CDDL-1.0.  See the License for the
+# specific language governing permissions and limitations under the License.
+#
+# When distributing Covered Code, include this CDDL HEADER in each file and
+# include the License file in a prominent location with the name LICENSE.CDDL.
+# If applicable, add the following below this CDDL HEADER, with the fields
+# enclosed by brackets "[]" replaced with your own identifying information:
+#
+# Portions Copyright (c) [yyyy] [name of copyright owner]. All rights reserved.
+#
+# CDDL HEADER END
+#
+
+#
+# Copyright (c) 2013--2018, Regents of the University of Minnesota.
+# All rights reserved.
+#
+# Contributors:
+#    Richard Berger
+#    Christoph Junghans
+#    Ryan S. Elliott
+#
+
+#
+# Release: This file is part of the kim-api.git repository.
+#
+
+
+# - Find KIM-API-V2
+#
+# sets standard pkg_check_modules variables plus:
+#
+# KIM-API-V2-CMAKE_C_COMPILER
+# KIM-API-V2-CMAKE_CXX_COMPILER
+# KIM-API-V2-CMAKE_Fortran_COMPILER
+#
+find_package(PkgConfig REQUIRED)
+include(FindPackageHandleStandardArgs)
+
+pkg_check_modules(KIM-API-V2 REQUIRED libkim-api-v2>=2.0)
+
+pkg_get_variable(KIM-API-V2-CMAKE_C_COMPILER libkim-api-v2 CMAKE_C_COMPILER)
+pkg_get_variable(KIM-API-V2-CMAKE_CXX_COMPILER libkim-api-v2 CMAKE_CXX_COMPILER)
+pkg_get_variable(KIM-API-V2_CMAKE_Fortran_COMPILER libkim-api-v2 CMAKE_Fortran_COMPILER)
+
+# handle the QUIETLY and REQUIRED arguments and set KIM-API-V2_FOUND to TRUE
+# if all listed variables are TRUE
+find_package_handle_standard_args(KIM-API-V2 REQUIRED_VARS KIM-API-V2_LIBRARIES)