added proof-of-concept test/fvSolutionCombine

- could also move to utilities/miscellaneous

- the dictionary compare contents might be useful enough to move
  into dictionary code.

- usage example (w/o -rewrite):

      for i in $(find -name fvSolution)
      do
          fvSolutionCombine -case "${i%/system/fvSolution}"
      done

applications/test/fvSolutionCombine/Make/files

@@ -0,0 +1,3 @@
+fvSolutionCombine.C
+
+EXE = $(FOAM_USER_APPBIN)/fvSolutionCombine

applications/test/fvSolutionCombine/Make/options

@@ -0,0 +1,5 @@
+EXE_INC = \
+    -I$(LIB_SRC)/finiteVolume/lnInclude
+
+EXE_LIBS = \
+    -lfiniteVolume