Added Flask-Script based manage.py file
Removed obsolete debug.py
Replaced obsolete "shell.py" by "manage.py shell"
scripts: Converted import_srtm.py to manage.py command
scripts: Converted tracking scripts to manage.py commands
manage.py: Only use create_combined_app() for "runserver" command
Replaced daemon.py by manage.py script
Replaced celery_worker.py by manage.py script
manage.py: Moved code into commands package
commands: Moved shell command to separate file
scripts: Converted flights related scripts to manage.py commands
scripts: Converted notifications related scripts to manage.py commands
scripts: Converted generate_assets.py scripts to manage.py command
scripts: Converted merge_user.py script to manage.py command
scripts: Converted initialise_database.py script to manage.py command
scripts: Converted remaining scripts to manage.py commands
Fixed flake8 issues
commands: Improved database commands
commands: Use Flask-Migrate for database migrations
skylines: Added __about__.py file