Fix build in !HAVE_DUNE_CORNERPOINT case

This change-set is a roll-up of the modifications I had to do make the "refactor-for-cpgrid-support" branch (cf. OPM/opm-autodiff#100) build *without* dune-cornerpoint support.

Commit 688d65e fixes a real problem.  The nesting of a namespace-closing brace was wrong with respect to an "#endif" statement.  Similarly, commit 0f98ce7 fixes a simple syntax error--possibly arising as a result of a mismerge.  Commits 897a33c and fdca540 bring new features.  The former adds support for older versions of Dune (e.g., 2.2.1) and the latter ports "sim_fibo_ad_cp.cpp" completely to the new parser in module "opm-parser" by using the "GridManager"'s `createGrdecl()` function to build the intermediate information required by `CpGrid::processEclipseFormat()`.  Finally, commit 1cbffa0 fixes a memory leak I introduced when converting to use the `createGrdecl()` function.