[AL] Temporarily disable constructor for rows != colmuns.

This is used for parallel meshes and has to be implemented later.
Now it's not even tested.
md: enable parsing of processes' configs.
[T] Save local_to_global_map.

Otherwise there is a reference to temporary.
[AL] In LocalToGlobalIndexMap save a copy of _rows.

And the _columns are the same as _rows being a reference.
WIP move createDofMap to AL.