sync from my branch rev 983 and 993:

- module api change, if module fails to load it can give back an useful error message
- give a message when client doesnt supply a password when connecting
- some minor cleanup


git-svn-id: https://znc.svn.sourceforge.net/svnroot/znc/trunk@803 726aef4b-f618-498e-8847-2d620e286838

modules/schat.cpp

@@ -201,7 +201,7 @@ public:
 	MODCONSTRUCTOR(CSChat) {}
 	virtual ~CSChat() { CleanSocks(); }
 
-	virtual bool OnLoad( const CString & sArgs )
+	virtual bool OnLoad( const CString & sArgs, CString & sErrorMsg )
 	{
 		m_sPemFile = sArgs;
 
@@ -211,7 +211,7 @@ public:
 		}
 
 		if (!CFile::Exists(m_sPemFile)) {
-			PutModule("Unable to load pem file [" + m_sPemFile + "]");
+			sErrorMsg = "Unable to load pem file [" + m_sPemFile + "]";
 			return false;
 		}