Virtualenv files and dirs
PERFORMANCE TUNING

- adds parameter validate_fields to save method, turning field validation optional (default=True)
- removes Mutex lock for writing: pipeline() already creates an atomic transaction
Key removed
Test runner
Tuning
Tuning
Mutex tests disabled
Always saves the ID inside the data structure
Performance tests
value()
values() validation
Added count() to manager and modelset
Perform correct filtering when the database used is not the default (0)
Removes unused print statement
Refactoring: performance moved to tests folder
Fix validation problem: CharField raised exception if value was long/float/int
Return value consistency: returns True if save run whithout problems, False otherwise (returning an error list produces incorrect if result in statement 'if model.save()'...
field validation test
Added zindexable attribute in Attribute, to avoid isinstance comparison everytime. Each Attribute class knows whether it's zindexable or not
Adds method that returns all indexed values for a given model / attribute