Update processing of Usage doc key to not rely on order of "values"

Previously, we assumed that "values" would return a list whose first element
was a list of arguments for which isOption evaluated to true and whose second
element was a list of arguments for which it evaluated to false.  But the order
of the elements in "values" is too dependent on the internal workings of hash
tables (hash codes, buckets, linked lists, etc.), so we refactor the code to
not rely on it.

M2/Macaulay2/m2/document.m2

@@ -524,7 +524,8 @@ processUsage := (tag, fn, o) -> (
     then error "document: Inputs or Outputs specified, but Usage not provided";
     arg := if o.?Inputs then o.Inputs else {};
     out := if o.?Outputs then o.Outputs else {};
-    (ino, inp) := toSequence values partition(isOption, arg, {true, false});
+    isopt := partition(isOption, arg, {true, false});
+    (ino, inp) := (isopt#true, isopt#false);
     opt := getOptionDefaultValues tag.Key;
     inoh:= new HashTable from ino;
     if not isSubset(keys inoh, keys opt)