Forthcoming fixes

Changes for upcoming version 7.6.7.

I got out of the habit of writing down all the changes made; let me try to get back into the habit. -JR

Larger changes:

1. Added a new component to the interface to expand discrete variables into categorical indicator columns.
2. Fisher combined p-values were added to the Markov checker.

Small fixes

1. Added option to do sampling without replacement to the bootstrap editor in the interface.
2. Updated the calculation of the median of an array.