Support database dumps with spaces in names
Remove obsolete copyright notices
Support absolute reference when importing formula #2308
Refactor closure into private method for clarity #2181
Optimize descendants search speed #2181

We use ID instead of object whenever possible to avoid loading more than
needed and to avoid useless hydrating step by Doctrine
Expose _log() function for easier logging #2181
Optimize formulas speed for filter values and names #2181
Optimize formula speed for filter values and population values #2181
Optimize formulas speed for population values in same country #2181
Minor refactorting for clarity #2181
Optimize formulas speed for QuestionnaireFormulas #2181
Support multi-geonames for population cache #2181