Add tasks for all the new languages

Task/Optional-parameters/Phix/optional-parameters-1.phix

@@ -0,0 +1,6 @@
+function increment(integer i, integer inc=1)
+    return i+inc
+end function
+
+?increment(5)       -- shows 6
+?increment(5,2)     -- shows 7

Task/Optional-parameters/Phix/optional-parameters-2.phix

@@ -0,0 +1 @@
+printf(1,"%d records sorted in %3.2s\n",{records,time()-t0})

Task/Optional-parameters/Phix/optional-parameters-3.phix

@@ -0,0 +1,22 @@
+integer sortcol = 0
+integer sortdir = 1
+
+function by_column(integer i, integer j)
+    return sortdir*compare(data[i][sortcol],data[j][sortcol])
+end function
+
+sequence tags = tagset(table_size) -- {1,2,..table_size}
+
+function click_cb(Ihandle self, integer l, integer c, atom pStatus)
+string sortc
+...
+            sortc = sprintf("SORTSIGN%d",c)
+            sortdir = iff(IupGetAttribute(self,sortc)="DOWN"?-1:1)
+            IupSetAttribute(self,sortc,iff(sortdir=-1?"UP":"DOWN"))
+            sortcol = c
+            tags = custom_sort(routine_id("by_column"),tags)
+
+function value_cb(Ihandle /*self*/, integer l, integer c)
+    l = tags[l]
+    return data[l][c]
+end function