Improved build logic to ensure consisten Fortran compilers
- README.md updated and reflowed
- jsonfortran-${CMAKE_Fortran_COMPILER_ID} is now passed to `find_package()`
  by projects wishing to import jsonfortran
- libraries and mod files installed under fortran/${CMAKE_Fortran_COMPILER_ID}
  to enable parallel installation of packages built by different compilers the
  package config logic ensures that the correct compiler is used