Rename run-web-server.py to run-dev-web-server.py.
Rename test_X.py to X_tests.py.
utils_tests: Add a missing description of ChdirTests.
Add a new module: viewer.format.
format: Add a new function: format_age().
format: Add support for formatting negative ages.
format: Refactor format_age().
web: Use the formatting functions from format in the templates.
web: Rename before_request() to setup_git_repo().
web: Rename setup_jinja_filters() to setup_filters().