minor tweaks; updated todo.txt

lib/pure/httpserver.nim

@@ -192,7 +192,7 @@ when false:
     if path[path.len-1] == '/' or existsDir(path):
       path = path / "index.html"
 
-    if not ExistsFile(path):
+    if not existsFile(path):
       discardHeaders(client)
       notFound(client)
     else:

lib/system/threads.nim

@@ -243,7 +243,7 @@ when not defined(useNimRtl):
       
     # on UNIX, the GC uses ``SIGFREEZE`` to tell every thread to stop so that
     # the GC can examine the stacks?
-    proc stopTheWord() = nil
+    proc stopTheWord() = discard
     
 # We jump through some hops here to ensure that Nimrod thread procs can have
 # the Nimrod calling convention. This is needed because thread procs are