fix get new mail for pop, workaround PR_APPEND bustage, set m_position to file size

mailnews/local/src/nsParseMailbox.cpp

@@ -1303,6 +1303,7 @@ nsParseNewMailState::Init(MSG_Master *master, nsFileSpec &folder)
 //	SetMaster(master);
 	m_mailboxName = nsCRT::strdup(folder);
 
+	m_position = folder.GetFileSize();
 	// the new mail parser isn't going to get the stream input, it seems, so we can't use
 	// the OnStartBinding mechanism the mailbox parser uses. So, let's open the db right now.
 	nsIMsgDatabase * mailDB = nsnull;

mailnews/local/src/nsPop3Sink.cpp

@@ -113,7 +113,10 @@ nsPop3Sink::BeginMailDelivery(PRBool* aBool)
     nsFileSpec fileSpec(m_mailDirectory);
     fileSpec += "Inbox";
     m_outFileStream = new nsOutputFileStream(fileSpec, 
-                                             PR_WRONLY | PR_CREATE_FILE | PR_APPEND);
+                                             PR_WRONLY | PR_CREATE_FILE);
+	if (m_outFileStream)
+		m_outFileStream->seek(fileSpec.GetFileSize());
+
 
 	// create a new mail parser
     m_newMailParser = new nsParseNewMailState;