Add script to compare performance of various OpenFisca implementations.
Rename AST-based parser.
Rework tax rates tests to avoid warning and cleanup them.
Always call formula when an array for requested period doesn't exist yet: Don't interpolate array before calling formula.
Add used_periods key only if not empty
Add used_periods to period size independent holders.
Ignore tags file (built with ctags)
Fix AbstractEntityToEntity formula '@type' JSON attribute value
Remove obsolete Sphinx documentation from core.