Added &OPTIONAL to DESTRUCTURING-BIND. Currently it's just ignored (next step woudl be to support default values).
Added &OPTIONAL to DESTRUCTURING-BIND. Currently it's just ignored (next step woudl be to support default values).

fredericksilva/Parenscript,vsedach/Parenscript,3b/parenscript,JDReutt/parenscript,VincentToups/parenscript,manuel/parenscript