Update write_project_headers.py
Update write_project_headers.py

Edited for compatibility with Python 2.6.
hmgaudecker/econ-project-templates,hmgaudecker/econ-project-templates,MarekIgnaszak/econ-project-templates,RoyalTS/econ-project-templates,MarekIgnaszak/econ-project-templates,hmgaudecker/econ-project-templates,RoyalTS/econ-project-templates