Write down additional sources of dependencies to sources file.
Collect all dependencies in packages file.
Start fabfile implementation.
Implement install_dependencies task.
Add template for sysctl.conf
Add template for postgresql.conf
Implement system properties setup
Implement PostgreSQL properties setup
Add host RAM size config option
Cleanup
Implement setup_db task
Use built-in function to set sysctl values
Implement install_nominatim task. Refactoring