Added json helpers and installation of nlohmann/json.hpp

	modified:   CMakeLists.txt
	modified:   THcParmList.cxx
	renamed:    json.hpp -> nlohmann/json.hpp

src/CMakeLists.txt

@@ -89,6 +89,7 @@ install(TARGETS ${LIBNAME}
   RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
   )
 install(FILES ${allheaders} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+install(DIRECTORY nlohmann DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
 
 #----------------------------------------------------------------------------
 # libHallCDict

src/THcParmList.cxx

@@ -25,7 +25,7 @@ An instance of THaTextvars is created to hold the string parameters.
 #include <iomanip>
 
 #include "TBufferJSON.h"
-#include "json.hpp"
+#include "nlohmann/json.hpp"
 #include "TObjArray.h"
 #include "TObjString.h"
 #include "TSystem.h"