Handle key collisions when stitching meshes

This triggered for me with a 16-bit dof_id_type buildbot test, but
there's no reason it couldn't happen with a larger id type and much
worse luck.
Use dof_id_type in misc ex11
Merge pull request #280 from libMesh/mesh_stitch_bugfix

Handle key collisions when stitching meshes
Use the correct mesh for output in misc ex10
write_equation_systems de-inlining, extra assert

The extra assert catches the (just-fixed) bug in misc ex10.

The de-inlining seemed more sensible than adding another
equation_systems.h dependency, since this is a costly method to begin
with.
Merge pull request #281 from libMesh/double_check_mesh

Double check mesh in write_equation_systems
Use a multimap where we might have duplicate keys
Merge pull request #282 from libMesh/mesh_stitch_bugfix2

Use a multimap where we might have duplicate keys
Update traffic.
Adding Prudencio, 2014b.
AC_HELP_STRING -> AS_HELP_STRING

AS_HELP_STRING seems to have been in autoconf since 2004.

AC_HELP_STRING is officially obsolete, and apparently some autoconf
versions complain about it.

My version of autoconf thinks they're functionally exactly equivalent,
but since googling AS_HELP_STRING takes you to the correct manual page
and AC_HELP_STRING doesn't, we might as well use the former.
Adding missing boost header necessary for "shared_ptr" support on older compilers
Merge pull request #284 from permcody/add_missing_file

Adding missing boost header necessary for "shared_ptr" support on older ...
Adding standard autoconf test macro for determing C++11 support flag.

@roystgnr your name is on the author's list for this file, yet we
weren't using it in libmesh?!
Adding configure tests for C++11 features

* std::move
* std::shared_ptr
Only compile std::move code in fparser if the compiler supports it
Ran bootstrap.
GCC 4.6.3 does support -std=c++0x, but it doesn't support override.

So make the new configure test a bit less stringent.  This test is a
little tricky to get right -- it has to have *some* C++11 stuff to
accurately determine what the correct flag for turning on C++11
support is, but it can't test lots of features otherwise C++11 will
sometimes be disabled completely without good reason.
Merge pull request #283 from libMesh/as_help_string

AC_HELP_STRING -> AS_HELP_STRING
Fix a make_pair call in nanoflann.