IMAP: make the body fetch limit setting available.

* This is set by the ProtocolConfigView -- there should really be
  some constant for this.

src/add-ons/mail_daemon/inbound_protocols/imap/Settings.cpp

@@ -101,3 +101,10 @@ Settings::IdleMode() const
 {
 	return fMessage.GetBool("idle", true);
 }
+
+
+int32
+Settings::BodyFetchLimit() const
+{
+	return fMessage.GetInt32("partial_download_limit", -1);
+}

src/add-ons/mail_daemon/inbound_protocols/imap/Settings.h

@@ -30,6 +30,7 @@ public:
 
 			int32				MaxConnections() const;
 			bool				IdleMode() const;
+			int32				BodyFetchLimit() const;
 
 private:
 			const BMessage		fMessage;