* docs/html/parallel_mode.html: Added reference to MCSTL.
        More documentation on compile-time settings and tuning.
        * include/parallel/multiway_merge.h: Added reference to paper.
        * include/parallel/multiseq_selection.h: Added reference to paper.
        * include/parallel/workstealing.h: Added reference to paper.
        * include/parallel/balanced_quicksort.h: Added reference to paper.
        * include/parallel/tree.h: Added reference to paper.

From-SVN: r129129