Making a new LAT configuration which uses a new GEM configuration.

In this example we which to use the GEM vote file, new_gem.xml, to make a new LAT configuration. This will take 3 steps: 1) importing new_gem.xml under the FILE_TAG and alias ``GEM_V1'', 2) making a new new LPA vote file which reference the newly made TRG_+GEM vote file, 3) building the new configuration.

  prompt> bin/PrecinctManager.py TRG_GEM --import new_gem.xml -T GEM_V1 -a -b 
  prompt> bin/ConfigManager.py LPA --copy LAT-70x -T LAT-70x_newGem -a -b -r TRG_GEM=GEM_V1
  prompt> bin/ConfigManager.py --build -n
    [...lots of output while simulating build...]
  prompt> bin/ConfigManager.py --build
    [...lots of output while really doing build...]