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.

src/meshTools/triSurface/booleanOps/booleanSurface/booleanSurface.C

@@ -241,14 +241,14 @@ void Foam::booleanSurface::propagateEdgeSide
     {
         // Edge (and hence eFaces) in same order as prevVert0.
         // Take next face from sorted list
-        nextInd = (ind + 1) % eFaces.size();
-        prevInd = (ind > 0 ? ind - 1 : eFaces.size()-1);
+        nextInd = eFaces.fcIndex(ind);
+        prevInd = eFaces.rcIndex(ind);
     }
     else
     {
         // Take previous face from sorted neighbours
-        nextInd = (ind > 0 ? ind - 1 : eFaces.size()-1);
-        prevInd = (ind + 1) % eFaces.size();
+        nextInd = eFaces.rcIndex(ind);
+        prevInd = eFaces.fcIndex(ind);
     }