Allow overriding variable class in make_sym_vector
Make evaluator compatible with re-evaluating symbolic expressions when subscript-by-getitem is disabled
More readable stringification for GA's nabla and components
Flake8 happiness
Add CachingMapperMixin
Fix distributor power handling
Implement quotient handling in distributor
Preserve variable class in GA's dimensionalizer
Fix derivative binder to deal with nablas nested inside of derivative source