fix a mis-spelled variable name, handle a rare error condition.
Merge branch 'develop' of https://github.com/Apelon-VA/ISAAC.git into develop
Merge branch 'develop' of https://github.com/Apelon-VA/ISAAC.git into develop
populate UserProfile with values from app config
make clear the difference between variables that are truely read only,
and variables that may be overridden by the User via the preferences.