Add -[XMPPRoster deleteRosterItem:] and -[XMPPRosterItem copy].

src/XMPPRoster.h

@@ -35,4 +35,6 @@
 - (OFArray*)groups;
 - (OFArray*)rosterItemsInGroup: (OFString*)group;
 - (void)addRosterItem: (XMPPRosterItem*)rosterItem;
+- (void)updateRosterItem: (XMPPRosterItem*)rosterItem;
+- (void)deleteRosterItem: (XMPPRosterItem*)rosterItem;
 @end

src/XMPPRoster.m

@@ -98,6 +98,11 @@
 }
 
 - (void)addRosterItem: (XMPPRosterItem*)rosterItem
+{
+	[self updateRosterItem: rosterItem];
+}
+
+- (void)updateRosterItem: (XMPPRosterItem*)rosterItem
 {
 	XMPPIQ *iq = [XMPPIQ IQWithType: @"set"
 				     ID: [connection generateStanzaID]];
@@ -122,4 +127,24 @@
 
 	[connection sendStanza: iq];
 }
+
+- (void)deleteRosterItem: (XMPPRosterItem*)rosterItem
+{
+	XMPPIQ *iq = [XMPPIQ IQWithType: @"set"
+				     ID: [connection generateStanzaID]];
+	OFXMLElement *query = [OFXMLElement elementWithName: @"query"
+						  namespace: XMPP_NS_ROSTER];
+	OFXMLElement *item = [OFXMLElement elementWithName: @"item"
+						 namespace: XMPP_NS_ROSTER];
+
+	[item addAttributeWithName: @"jid"
+		       stringValue: rosterItem.JID.bareJID];
+	[item addAttributeWithName: @"subscription"
+		       stringValue: @"remove"];
+
+	[query addChild: item];
+	[iq addChild: query];
+
+	[connection sendStanza: iq];
+}
 @end

src/XMPPRosterItem.m

@@ -30,6 +30,23 @@
 	return [[[self alloc] init] autorelease];
 }
 
+- copy
+{
+	XMPPRosterItem *new = [[XMPPRosterItem alloc] init];
+
+	@try {
+		new->JID = [JID copy];
+		new->name = [name copy];
+		new->subscription = [subscription copy];
+		new->groups = [groups copy];
+	} @catch (id e) {
+		[new release];
+		@throw e;
+	}
+
+	return new;
+}
+
 - (OFString*)description
 {
 	return [OFString stringWithFormat: @"<XMPPRosterItem, JID=%@, name=%@, "