Log Message:
Update mdds to 1.0, based on the wip version by coypu and leot.

mdds 1.0.0

* all

  * introduced API versioning to ease parallel installation of API
    incompatible versions.  Version 1.0.0 will have an API versoin of
    1.0.

  * C++11 is now a hard requirement.

  * added API documentation via Doxygen, Sphinx and Breathe.

* mixed_type_matrix

  * officially removed for good in favor of multi_type_matrix.

* multi_type_vector

  * added memory usage reduction by conditionally shrinking the
    capacity of the underlying vector containers.

  * added slight performance gain by revising block adjustment policy
    during splitting of blocks.

* sorted_string_map

  * fixed a bug where a non-matching key was incorrectly returned as a
    matching key.