Merge branch 'master-cmake-CMP0074' into 'master'

Fix CMake policy issue

See merge request faser/calypso!158

CMakeLists.txt

-cmake_minimum_required(VERSION 3.6)
+cmake_minimum_required(VERSION 3.10)
+# suppress warning and unwanted behavior
+set(CMAKE_POLICY_DEFAULT_CMP0074 NEW)
 file( READ ${CMAKE_SOURCE_DIR}/version.txt _version )
 string( STRIP ${_version} _version )
 project( Calypso VERSION ${_version} LANGUAGES C CXX Fortran )