Make many scripts in src/utils Python 3 compatible.
Merge branch 'develop' into python3
Make many Python utilities compatible with Python3.
Removed build_dependencies.py since CMake determines dependencies.
Removed split_nuclide.py since there is full support for specifying natural
elements in a material.
Make run_tests.py script Python3 compatible.
Merge branch 'develop' into python3
Get content length in HTTP request appropriately when using Python 3.
Removed analyze_source.py script.
Default to python 2 for voxel.py and statepoint_3d.py.
Use integer division in statepoint_meshplot.py.
Merge branch 'python3' of github.com:paulromano/openmc into paulromano-python3
Removing eigenfunction_rms from utilities per discussion with bhermanmit
Merge branch 'paulromano-python3' into develop