Macro impl_div_methods 

macro_rules! impl_div_methods {
    ($alg_type:ty, $field_type:ty $(, ($type_param:ty, $param_name:ty))?) => { ... };
}

Given two structs Alg and Field where Alg implements From<Field>, implement Div<Field> and DivAssign<Field> for Alg.

Both are implemented in the simplest way by first applying the .inverse() map from Field then using the From to map the inverse to an Alg element before applying the native mul or mul_assign methods on Alg elements.

This can also be used with Alg = Field to implement Div and DivAssign for Field.