Rename tests for externals

stdlib/ext/file-ext.mc

@@ -120,12 +120,12 @@ with ("Hello", "Next string", "Final", "EOF") in
 
 -- Test reading x amount of characters from the file
 utest
-  match readOpen filename with Some rc then
-    let l1 = match readBytes rc 3 with Some s then s else "" in
-    let l2 = match readBytes rc 4 with Some s then s else "" in
-    let l3 = match readBytes rc 0 with Some s then s else "" in
-    let l4 = match readBytes rc 1 with Some s then s else "" in
-    readClose rc;
+  match fileReadOpen filename with Some rc then
+    let l1 = match fileReadBytes rc 3 with Some s then s else "" in
+    let l2 = match fileReadBytes rc 4 with Some s then s else "" in
+    let l3 = match fileReadBytes rc 0 with Some s then s else "" in
+    let l4 = match fileReadBytes rc 1 with Some s then s else "" in
+    fileReadClose rc;
     (l1,l2,l3,l4)
   else ("Error reading file","","","")
 with ("Hel", "lo\nN", "", "e") in