COMP: External packages were out of sync

Needed to make compatible version of external packages.

Also updated to allow more robust building of references
external packages by default and require the programmer
to explicitly turn off skipping update steps.
STYLE:  Improve documentation for DWIConvert

The DWIConvert help had spelling error, and more verbose description of the
useBMatrix was provided.
ENH:  Remove beta code

During review of Slicer we are turning off
modules that are not really necessary.
COMP: rebase from BRAINSia craziness