CONFIG: add Cray compiler, cray mpich settings, wmake rules (fixes #558)

- the cray C/C++ compilers appear to be option-compatible with gcc.

- no wmake rules for 32bit builds (deemed to be unnecessary)

etc/config.csh/mpi

@@ -141,6 +141,28 @@ case MPICH-GM:
     _foamAddLib     $GM_LIB_PATH
     breaksw
 
+case CRAY-MPICH:
+    if ( ! $?MPICH_DIR ) setenv MPICH_DIR /dev/null
+    setenv FOAM_MPI cray-mpich
+    setenv MPI_ARCH_PATH $MPICH_DIR
+
+    if ($?FOAM_VERBOSE && $?prompt) then
+        echo "Using $WM_MPLIB"
+        echo "    FOAM_MPI  : $FOAM_MPI"
+        echo "    MPICH_DIR : $MPI_ARCH_PATH"
+    endif
+
+    if ( ! -d "$MPI_ARCH_PATH" ) then
+        echo "Warning in $WM_PROJECT_DIR/etc/config.csh/mpi:"
+        echo "    Not a valid $WM_MPLIB installation directory."
+        echo "    Please set MPICH_DIR properly."
+        echo "    Currently using '$MPI_ARCH_PATH'"
+    endif
+
+    # _foamAddPath    $MPI_ARCH_PATH/bin
+    _foamAddLib     $MPI_ARCH_PATH/lib
+    breaksw
+
 case HPMPI:
     setenv FOAM_MPI hpmpi
     setenv MPI_HOME /opt/hpmpi

etc/config.csh/settings

@@ -214,12 +214,17 @@ if (! $?WM_COMPILER_TYPE ) setenv WM_COMPILER_TYPE system
 # Adjustments for non-gcc compilers
 switch ("$WM_COMPILER")
 case Clang*:
-    # Using clang - not gcc
+    # Using clang compiler suite
     setenv WM_CC 'clang'
     setenv WM_CXX 'clang++'
     breaksw
+case Cray*:
+    # Using cray system compilers
+    setenv WM_CC 'cc'
+    setenv WM_CXX 'CC'
+    breaksw
 case Icc*:
-    # Using icc - not gcc
+    # Using intel compilers
     setenv WM_CC 'icc'
     setenv WM_CXX 'icpc'
     breaksw