conflict
added convenience methods for debug, disable, root, and background
Added scad_render_animated_file() to solidpython.py
Added back_and_forth argument to scad_render_animated_file()
restored some comments
Fixed bug where file_header and includes weren't getting written to animated files
own function for including solidpython code in generated scad
added unit tests for modifier convenience methods
Added animation_example.py.   Cleaned up run_all_examples.sh formatting
Added Animation section to README.md
Added test_scad_render_animated_file()
added test_scad_render_to_file()
formatting
Consolidated pyeuclid patching code into path_euclid.py