Add tasks for all the new languages

Task/Sorting-algorithms-Pancake-sort/Phix/sorting-algorithms-pancake-sort.phix

@@ -0,0 +1,29 @@
+function flip(sequence s, integer n)
+    for i=1 to floor(n/2) do
+        {s[i],s[n-i+1]} = {s[n-i+1],s[i]}
+    end for
+    return s
+end function
+
+function pancake_sort(sequence s)
+integer m
+    for i=length(s) to 2 by -1 do
+        m = 1
+        for j=2 to i do
+            if s[j]>s[m] then
+                m = j
+            end if
+        end for
+        if m<i then
+            if m>1 then
+                s = flip(s,m)
+            end if
+            s = flip(s,i)
+        end if
+    end for
+    return s
+end function
+
+constant s = shuffle(tagset(10))
+? s
+? pancake_sort(s)