Bug fixes and better QA

Bug fixes

• #435 reported by @jbmaggard: Wrong type declaration for MPI variable
• Use standard Fortran for integration test
  coarray_distributed_transpose.F90; no calls to MPI
• Replace mpif90 with MPI standards endorsed mpifort in build script
• #381 Implement sane SOVERSIONing scheme and build static+dynamic lib by
  default:
  • 0 if GFortran < 6.0.0 OR non-GNU Fortran compiler
  • 1 if 6.0.0 <= GFortran < 7.0.0
  • 2 if GFortran >= 7.0.0
• #366 Build static and dynamic/shared libs, ensure parallel builds do not
  fail due to CMake Fortran .mod file idiosyncrasies
• Assert correct number of images in `async_comp_alloc_2
• #268 Configure caf and cafrun at build time in sane/canonical way
• #437 abstract MPI runtime flags needed for enabling failed image support
  and default to enabling them
• Fix Windows (WSL) install script, was failing due to versioning logic
• #447 Upstream changes to the GFortran array descriptor in trunk/8.x
  broke some OpenCoarrays functionality. Library and private descriptor
  header were updated to resolve this issue and wrapped in #ifdef guards
  to ensure backwards compatibility.

Enhancements

• #275 use generated caf script to compile tests and cafrun to run them
  • caf is well behaved enough that it can be passed to CMake as a Fortran
    compiler
  • Simple tests are compiled by directly calling caf with a CMake macro
  • One or two of the more complicated integration tests are compiled by
    setting CMAKE_Fortran_COMPILER to bin/caf
• Improved system introspection and support for
  • Intel MPI
  • Windows builds (other than WSL) (work in progress)
• Experimental OpenSHMEM based version added to git repo, but not available
  in releases

Installation

Please see the installation instructions for more details on how to build and install this version of OpenCoarrays

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