added PTVFileSystem.pdf by Simon Kolotov to /docs added tracking_run_py.c Cython generated file to .gitignore
added PTVFileSystem.pdf by Simon Kolotov to /docs
added tracking_run_py.c Cython generated file to .gitignore

OpenPTV/openptv-python,jimmy516/openptv-python,jimmy516/openptv-python,jimmy516/openptv-python,jimmy516/openptv-python,OpenPTV/openptv-python,OpenPTV/openptv-python