removed backup files, added ISIS preferences file for Bullet
removed backup files, added ISIS preferences file for Bullet

USGS-Astrogeology/ISIS3_scripts,USGS-Astrogeology/ISIS3_scripts,USGS-Astrogeology/ISIS3_scripts,thareUSGS/ISIS3_scripts,thareUSGS/ISIS3_scripts,USGS-Astrogeology/ISIS3_scripts,thareUSGS/ISIS3_scripts,thareUSGS/ISIS3_scripts