Initial changes to comply with new CRAN policy of not allowing
the use of ':::'.
Changed ch99AsymptoticDF and cerioli10.fsrmcd.test.r to use the
exported versions of MCDcons and MCDcnp2 from the latest version of
robustbase. This solves two of the issues raised in the initial CRAN
submission.

Also updated the DESCRIPTION file to reflect Doug as thesis advisor
and to require robustbase 0.91_1 or higher (for the exported functions
we need).