More warnings in the help file. Refs #10829
Usage example for MDNormDirectSC. Refs #10829

Also enabled the parallel processing. Refs #10830
Usage example. Refs #10829

The MDNorm concept page will be expanded as part of ticket #9105
cont_nonzero not found on older numpy version. Refs #10829
Merge remote-tracking branch 'origin/bugfix/10829_MDNormDirectSC_help'