Revert "Draw samples individually for choosers"
Revert "Draw samples individually for choosers"

The performance hit from this change were deemed to large in comparison
to the correctness of not repeatedly sampling alternatives.

This reverts commit d17a5ced1aca84e9e0fce0249921255804d51a52.

SANDAG/urbansim,SANDAG/urbansim,AZMAG/urbansim,ual/urbansim,waddell/urbansim,synthicity/urbansim,AZMAG/urbansim,waddell/urbansim,UDST/urbansim,ual/urbansim,apdjustino/urbansim,VladimirTyrin/urbansim,apdjustino/urbansim,VladimirTyrin/urbansim,SANDAG/urbansim,bricegnichols/urbansim,VladimirTyrin/urbansim,UDST/urbansim,synthicity/urbansim,AZMAG/urbansim,bricegnichols/urbansim,VladimirTyrin/urbansim,bricegnichols/urbansim,UDST/urbansim,apdjustino/urbansim,apdjustino/urbansim,SANDAG/urbansim,waddell/urbansim,ual/urbansim,bricegnichols/urbansim,UDST/urbansim,synthicity/urbansim,ual/urbansim,synthicity/urbansim,waddell/urbansim,AZMAG/urbansim