BUGFIX: Fixed a missing argument in Navigator
BUGFIX: Fixed a missing argument in Navigator

-- This caused the track to be incorrectly updated after each step, causing no energy to be lost and momentum to be incorrectly updated.

git-svn-id: 9e43e5c0b822a6a38dd81306e184699a3a573cb4@139 7850984a-0f19-49c7-84f0-416d0ede6f3e

mjrasobarnett/ucnsim,mjrasobarnett/ucnsim,mjrasobarnett/ucnsim