added argument validation clause to (vicare arguments validation)
review of srfi 13 docs
review of srfi 13: predicate functions
added unsafe operation bindings to (vicare unsafe-operations)
review of srfi 13: constructor functions
fixed start-and-past argument validation clauses
review of srfi 13: list functions
review of srfi 13: string selection functions
review of srfi 13: modification functions
review of srfi 13: comparison and hash functions
updated contributors file
review of srfi 13: prefix functions
review of srfi 13: more macros used in function definition
review of srfi 13: search functions
review of srfi 13: case-map functions
review of srfi 13: reverse and concatenate functions
review of srfi 13: map and fold functions
review of srfi 13: replicating functions
review of srfi 13: misc functions
updated todo file