set cmake Boost find policy. Removed NeXus library find from cmake, since it will not be used anymore.

CMakeLists.txt

@@ -1,6 +1,9 @@
 # - musrfit
 cmake_minimum_required(VERSION 3.17)
 
+# cmake: use BoostConfig.cmake instead of FindBoost
+cmake_policy(SET CMP0167 NEW)
+
 project(musrfit VERSION 1.9.10 LANGUAGES C CXX)
 
 #--- musrfit specific options -------------------------------------------------
@@ -206,14 +209,13 @@ if (qt_based_tools)
   endif (qt_version STREQUAL 3)
 endif (qt_based_tools)
 
-#--- if NeXus check also for HDF4, HDF5, and MXML -----------------------------
+#--- if NeXus check also for HDF4 (optional), HDF5 ----------------------------
 if (nexus)
   find_package(HDF5 COMPONENTS CXX REQUIRED)
   if (HAVE_HDF4)
     find_package(HDF4 REQUIRED)
     add_definitions(-DHAVE_HDF4)
   endif (HAVE_HDF4)  
-  find_package(NEXUS REQUIRED)
   add_definitions(-DPNEXUS_ENABLED)
 endif (nexus)
 
@@ -316,7 +318,6 @@ if (nexus)
     message(" HDF4    not present.")	  
   endif (HAVE_HDF4)	  
   message(" HDF5    found in ${HDF5_INCLUDE_DIRS}, Version: ${HDF5_VERSION}")
-  message(" NeXus   found in ${NEXUS_INCLUDE_DIR}, Version: ${NEXUS_VERSION_STRING}")
 endif (nexus)
 
 message("")