Started implementing flags to handle the sharing mode.

What works:
- the gui shows the flags in ShareManager
- the flags are loaded/saved to ft_shared.cfg and passed on to FileIndexMonitor
What does not work yet:
- the flags are not accounted for yet by FileIndexMonitor

In addition:
- simplified the directories dialog in Preferences, so that it calls the ShareManager instead of dupplicating the directories management 
code that becomes larger.
- setup the ShareManager to be a singleton, so as to coherently call it from different places.




git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@1486 b45a01b8-16f6-495d-af2f-9b41ad6348cc

libretroshare/src/upnp/upnputil.c

@@ -153,7 +153,7 @@ bool SetRedirectAndTest(struct UPNPUrls * urls,
    #else
         /* The lease parameter is also gone in minupnpc 1.0 */
 	r = UPNP_AddPortMapping(urls->controlURL, data->servicetype,
-                                eport, iport, iaddr, 0, proto);
+                                eport, iport, iaddr,0, 0, proto);
    #endif
 #endif