CONFIG: rationalize mpi config tuning (#1910)

- prefix FOAM_MPI and library directories with 'sys-' for system
  versions for uniform identication.

  WM_MPLIB      | libdir (FOAM_MPI)  | old naming |
  SYSTEMMPI     | sys-mpi            | mpi        |
  SYSTEMOPENMPI | sys-openmpi        | openmpi-system |

- prefix preferences with 'prefs.' to make them more easily
  identifiable, and update bin/tools/create-mpi-config accordingly

      Old name: config.{csh,sh}/openmpi
      New name: config.{csh,sh}/prefs.openmpi

- additional mpi preferences now available:
    * prefs.intelmpi
    * prefs.mpich
    ...

CONFIG: added hook for EASYBUILDMPI (eb-mpi), somewhat like USERMPI

- EasyBuild uses mpicc when compiling, so no explicit wmake rules are
  used

ENH: support different major versions for system openmpi

- for example, with

     WM_MPLIB=SYSTEMOPENMPI2

  defines FOAM_MPI=sys-openmpi2 and thus creates lib/sys-openmpi2

ENH: centralize handling of mpi as 'mpi-rules'

    Before:
        sinclude $(GENERAL_RULES)/mplib$(WM_MPLIB)
        sinclude $(DEFAULT_RULES)/mplib$(WM_MPLIB)

        ifeq (,$(FOAM_MPI_LIBBIN))
            FOAM_MPI_LIBBIN := $(FOAM_LIBBIN)/$(FOAM_MPI)
        endif

    After:
        include $(GENERAL_RULES)/mpi-rules

- also allows variants such as SYSTEMOPENMPI2 to be handled separately

applications/test/00-dummy/library/mpi/Make/options

@@ -2,13 +2,7 @@
 PROJECT_INC =
 PROJECT_LIBS =
 
-sinclude $(GENERAL_RULES)/mplib$(WM_MPLIB)
-sinclude $(DEFAULT_RULES)/mplib$(WM_MPLIB)
-
-/* Default is PROJECT LIB/mpi target */
-ifeq (,$(FOAM_MPI_LIBBIN))
-    FOAM_MPI_LIBBIN := $(FOAM_LIBBIN)/$(FOAM_MPI)
-endif
+include $(GENERAL_RULES)/mpi-rules
 
 EXE_INC = \
     -I.. \

applications/test/parallel-external-init/Make/options

@@ -1,5 +1,4 @@
-sinclude $(GENERAL_RULES)/mplib$(WM_MPLIB)
-sinclude $(DEFAULT_RULES)/mplib$(WM_MPLIB)
+include $(GENERAL_RULES)/mpi-rules
 
 EXE_INC  = $(PFLAGS) $(PINC) $(c++LESSWARN)
 EXE_LIBS = $(PLIBS)