Added @literal-algol{} and started an algol60 test suite (apologies

if there already was one that I didn't find). Also fixed syntax
error raising procedure.

closes PR 12859

original commit: c0b928c758cc64b7b902fbe38838d31a3c1bc008

collects/algol60/cfg-parser.rkt

@@ -485,7 +485,7 @@
       [(_ clause ...)
        (let ([clauses (syntax->list #'(clause ...))])
          (let-values ([(start grammar cfg-error parser-clauses)
-		       (let ([all-toks (apply
+                       (let ([all-toks (apply
 					append
 					(map (lambda (clause)
 					       (syntax-case clause (tokens)