Add tasks for all the new languages

Task/Permutations/Phix/permutations-1.phix

@@ -0,0 +1,17 @@
+global function permute(integer n, sequence set)
+--
+-- return the nth permute of the given set.
+-- n should be an integer in the range 1 to factorial(length(set))
+--
+sequence res
+integer w
+    n -= 1
+    res = set
+    for i=length(set) to 1 by -1 do
+        w = remainder(n,i)+1
+        res[i] = set[w]
+        set[w] = set[i]
+        n = floor(n/i)
+    end for
+    return res
+end function

Task/Permutations/Phix/permutations-2.phix

@@ -0,0 +1,8 @@
+function permutes(sequence set)
+sequence res = repeat(0,factorial(length(set)))
+    for i=1 to length(res) do
+        res[i] = permute(i,set)
+    end for
+    return res
+end function
+?permutes("abcd")