bad permissions on description/camera/camera.py in obs_lsstSim

the file description/camera/camera.py in obs_lsstSim has permissions 600. This makes it impossible on shared stacks for anyone but the user who installed the stack to read in the LSST camera model. The file needs to at least have permissions 644 (i.e. readable by 'group' and 'other'). FYI description/camera/camera.py is created when you run scons on obs_lsstSim.

If there was some way we could add a unit test that tested for a failure of this kind, that would also be nice.