Added method on BOUND-VARIABLES specialized to FOR-AS-HASH subclause.
Added method on BOUND-VARIABLES specialized to FOR-AS-HASH subclause.

clasp-developers/SICL,vtomole/SICL,clasp-developers/SICL,vtomole/SICL,clasp-developers/SICL,clasp-developers/SICL,vtomole/SICL,vtomole/SICL