changed the algorithm how sessions work:

- if the IP is banned or there is no a winix function then we set a temporary session
- else
  if there is a session's cookie sent by the client then:
   - if the cookie is a correct session's cookie then we set the session from the cookie
   - or if the cookie is not a correct session's cookie (e.g. session expired) and the winix function
     requires a cookie then we set a new session
   - or if there is no cookie sent then if a winix function requires a session we create a new session

  if there was an error creating a new session or event counters reach a ban limit then a temporary session will be used





git-svn-id: svn://ttmath.org/publicrep/winix/trunk@1115 e52654a7-88a9-db11-a3e9-0013d4bc506e

winixd/functions/download.cpp

@@ -5,7 +5,7 @@
  */
 
 /* 
- * Copyright (c) 2008-2014, Tomasz Sowa
+ * Copyright (c) 2008-2018, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -47,6 +47,7 @@ namespace Fun
 Download::Download()
 {
 	fun.url = L"download";
+	need_session = false;
 }