Merge CCPP code, separate from FV3 repository

[climbfuji]

This PR contains the following changes:

• merge portability features and bugfixes from CCPP version
  • portability features for GNU and PGI compilers
  • Intel MKL support to replace scrft/dcrft calls (required on macOS) if appropriate MKL flags are passed to build system (on by default only for macOS and generic Linux in NEMSfv3gfs, off for all NOAA and CISL HPC platforms)
  • wrap code in each file in a Fortran module and make use statements as explicit as possible (using only)
  • clean up redundant definitions of number of OpenMP threads and MPI tasks, remove repeated system calls to query those
  • create own la2ga_stochy version of FV3's la2ga code that is optimized for the needs of the stochastic physics package (and as such is faster)
  • add guards that prevent running cellular automata code with non-uniform blocksizes
  • use model namelist variables do_sppt, do_shum, do_skeb, do_sfcperts (similar to do_ca) and compare them to the values in the stochastic physics namelist sections to ensure consistency (this was required for CCPP in the past, and is now also required for IPD, because the IPD data container initialization has to happen entirely before the stochastic physics can be initialized)
• make necessary changes to use stochastic physics from separate GitHub repository (interface variables to stochastic physics entry routines, makefile)
• trim trailing whitespaces in all files

[pjpegion]

Changes look good.