2004-09-04 jrandom

* Added some basic guards to prevent multiple instances from running.
       Specifically, a file "router.ping" in the install directory which is
       written to once a minute - if that file exists and has been modified
       within the last minute, refuse to start up.  In turn, adjust the
       service wrapper to wait a minute before restarting a crashed JVM.
     * Create a "work" directory in the I2P install dir which Jetty will
       use for all of its temporary files.
     * Tell the browser not to cache most of the router console's pages.

apps/routerconsole/jsp/nav.jsp

@@ -1,4 +1,10 @@
-<% 
+<% response.setHeader("Pragma", "no-cache");
+   response.setHeader("Cache-Control","no-cache");
+   response.setDateHeader("Expires", 0);
+   // the above will b0rk if the servlet engine has already flushed
+   // the response prior to including nav.jsp, so nav should be 
+   // near the top
+   
    if (request.getParameter("i2p.contextId") != null) {
        session.setAttribute("i2p.contextId", request.getParameter("i2p.contextId")); 
    }%>