Added method on INTERPRET-AST specialized to EQ-AST.
Added method on INTERPRET-AST specialized to EQ-AST.

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