Include mpi.h in base/config.h to avoid Intel compile error

On my system with Intel compiler, I used to get the following error:
In file included from /lrz/sys/intel/mpi_41_3_048/intel64/include/mpi.h(1279),
                 from [...]/deal.II/include/deal.II/base/mpi.h(23),
                 from [...]/deal.II/include/deal.II/base/utilities.h(21),
                 from [...]/deal.II/include/deal.II/base/index_set.h(20),
                 from [...]/deal.II/include/deal.II/lac/vector.h(24),
                 from [...]/deal.II/source/numerics/data_out_faces.cc(18):
/lrz/sys/intel/mpi_41_3_048/intel64/include/mpicxx.h(99): error: #error directive: "SEEK_CUR is #defined but must not be for the C++ binding of MPI. Include mpi.h before stdio.h"
  #error "SEEK_CUR is #defined but must not be for the C++ binding of MPI. Include mpi.h before stdio.h"
   ^

This is Intel compiler 15.0 with Intel MPI. The solution to this problem is to include mpi.h early enough, which for us means to include it in base/config.h before we include types.h.
Merge pull request #271 from kronbichler/master

Include mpi.h in base/config.h to avoid Intel compile error
Improve grammar of error message.
Merge pull request #274 from bangerth/doc-fixes-11

Improve grammar of error message.
Improve error message for out-of-bound access in parallel vector
Merge pull request #275 from kronbichler/master

Improve error message for out-of-bound access in parallel vector
Fix an issue reported by David Wells.

The problem here is that class DoFHandler only uses pointers to the
DoF faces and levels objects in the .h file, so we thought that we
don't have to #include the respective header files where these classes
are declared. But we also have a serialization function that uses
them and if you call it, the compiler will complain about undeclared
classes being used.
Add the corresponding testcase for hp::DoFHandler as well, just to be on the safe side.
Merge pull request #278 from bangerth/fix-serialization-of-dof-handlers

Fix serialization of dof handlers
Update documentation in one place.
Merge pull request #280 from bangerth/doc-update-4

Update documentation in one place.
Merge branch 'master' of github.com:l-korous/dealii
Fix issues with tests - disable tests on MSVC completely.
Fix subdivided_parallelepiped instantiation.
Remove instantiation of non-existent methods.