POP: allow space in username

git-svn-id: http://svn.code.sf.net/p/davmail/code/trunk@1153 3d1905a2-6b24-0410-a738-b14d5a86fcbd

src/java/davmail/pop/PopConnection.java

@@ -112,7 +112,7 @@ public class PopConnection extends AbstractConnection {
                         password = null;
                         session = null;
                         if (tokens.hasMoreTokens()) {
-                            userName = tokens.nextToken();
+                            userName = line.substring("USER ".length());
                             sendOK("USER : " + userName);
                             state = State.USER;
                         } else {