set_afd_equal
Description:
Check whether a set of strings to AbstractFieldDetails are equal.
This performs a deep check for equality, checking whether both sets are of the same size, and that each key maps to the same set of values in both maps.
Parameters:
| a | 
           a set to compare  | 
      
| b | 
           another set to compare  | 
      
Returns:
| 
           
  | 
      
Since:
0.6.0