Add pole creation utility

[dchassin]

This PR adds a utility to automatically populate a network model with poles and mount equipment on the poles.

Current issues

None

Code changes

• Add python_extras/create_poles.py to generate a GLM fragment that add poles to an existing network.
• Add support for players that read property list from CSV header instead of player object property.

Documentation changes

• Add /Utilities/Create_poles
• Update /Module/Tape/Player

Test and Validation Notes

• Added module/tape/autotest/test_player_header.glm to test ability to use CSV header as property list.
• Added python_extras/ieee13.glm bare network model for testing. Example command:

$ gridlabd create_poles python_extras/example/ieee13.glm --spacing=100 --pole_type=WOOD-EC-45/4 --location=37.5,-122.2 --include_weather --ignore_location --output=/tmp/test.glm --include_network
$ gridlabd /tmp/test.glm