consistency update

- OSspecific: chmod() -> chMod(), even although it's not used anywhere

- ListOps get subset() and inplaceSubset() templated on BoolListType

- added UList<bool>::operator[](..) const specialization.
  Returns false (actually pTraits<bool>::zero) for out-of-range elements.
  This lets us use List<bool> with lazy evaluation and no noticeable
  change in performance.

- use rcIndex() and fcIndex() wherever possible.
  Could check if branching or modulus is faster for fcIndex().

- UList and FixedList get 'const T* cdata() const' and 'T* data()' members.
  Similar to the STL front() and std::string::data() methods, they return a
  pointer to the first element without needing to write '&myList[0]', recast
  begin() or violate const-ness.

applications/test/primitivePatch/testPrimitivePatch.C

@@ -69,7 +69,7 @@ void checkFaceEdges
 
         forAll(f, fp)
         {
-            label fp1 = (fp + 1) % f.size();
+            label fp1 = f.fcIndex(fp);
 
             if (edges[myEdges[fp]] != edge(f[fp], f[fp1]))
             {