ENH: support independent specification of surface read/write format (#1600)

- adjustments to internal handling to improve run-time addition of
  other formats (eg, with additional user library)

  For example, to write a binary STL with a '.stl' extension:

    $ surfaceMeshConvert input.obj  -write-format stlb  output.stl

  Or in a sampler,
  to specify the input type without ambiguity:

  surf
  {
      type        meshedSurface;
      surface     sampling.inp;

      fileType    starcd;
      scale       0.001;
      ...
  }

STYLE: regularize naming for input/output scaling

  * -read-scale   (compat: -scaleIn)
  * -write-scale  (compat: -scaleOut)

CONFIG: change edge/surface selection name for STARCD format

- now select as "starcd" instead of "inp" to avoid naming ambiguity
  with abaqus

applications/utilities/mesh/conversion/ccm/ccmToFoam/ccmToFoam.C

@@ -171,7 +171,7 @@ int main(int argc, char *argv[])
     fileName exportName;
     if (args.readIfPresent("name", exportName))
     {
-        const word ext = exportName.ext();
+        const word ext(exportName.ext());
         // strip erroneous extension (.ccm, .ccmg, .ccmp)
         if (ext == "ccm" || ext == "ccmg" || ext == "ccmp")
         {

applications/utilities/mesh/conversion/ccm/foamToCcm/foamToCcm.C

@@ -133,7 +133,7 @@ int main(int argc, char *argv[])
     fileName exportName = ccm::writer::defaultMeshName;
     if (args.readIfPresent("name", exportName))
     {
-        const word ext = exportName.ext();
+        const word ext(exportName.ext());
         // strip erroneous extension (.ccm, .ccmg, .ccmp)
         if (ext == "ccm" || ext == "ccmg" || ext == "ccmp")
         {