- TLS revised (again)

- TLS Session resumption issues resolved
- Credential prompt has "Remember" checkbox initially selected when credentials originate from Windows Credential Manager
- Last authentication attempt failure notice is more general and no longer insinuate user credentials are the likely cause of the failure
- Additional log messages added

lib/TLS/include/Credentials.h

@@ -200,7 +200,7 @@ namespace eap
         /// - \c true  if credentials were set;
         /// - \c false otherwise
         ///
-        bool combine(
+        source_t combine(
             _In_       const credentials_tls   *cred_cached,
             _In_       const config_method_tls &cfg,
             _In_opt_z_       LPCTSTR           pszTargetName);