set_features
Description:
Sets the features for the structure at index.
Parameters:
| this | 
           a Caps  | 
      
| index | 
           the index of the structure  | 
      
| features | 
           the CapsFeatures to set  | 
      
Sets the features for the structure at index.
| this | 
           a Caps  | 
      
| index | 
           the index of the structure  | 
      
| features | 
           the CapsFeatures to set  |