CPRuleEditor & CPPredicateEditor & CPPredicateEditorRowtemplate implementations with theming, nib2cib support.

Tests: CPRuleEditorCibTest, CPPredicateEditorCibTest, SmartFoldersDemo: a real world usage of CPPredicateEditor.
Documentation for these 3 new classes.

AppKit/CPRuleEditor/_CPPredicateEditorTree.j

@@ -0,0 +1,33 @@
+/*
+ *     Created by cacaodev@gmail.com.
+ *     Copyright (c) 2011 Pear, Inc. All rights reserved.
+ */
+
+@implementation _CPPredicateEditorTree : CPObject
+{
+    CPPredicateEditorRowTemplate         template @accessors;
+    CPString                                title @accessors(copy);
+    CPArray                              children @accessors(copy);
+    CPInteger                   indexIntoTemplate @accessors;
+    CPInteger                       menuItemIndex @accessors;
+}
+
+- (id)copy
+{
+    var tree = [[_CPPredicateEditorTree alloc] init];
+    [tree setTemplate:template];
+    [tree setTitle:title];
+    [tree setMenuItemIndex:menuItemIndex];
+    [tree setIndexIntoTemplate:indexIntoTemplate];
+    [tree setChildren:children];
+
+    return tree;
+}
+
+- (CPString)description
+{
+    return [CPString stringWithFormat:@"<%@: %p (%@) [%d-%d] T:%p at:%d> [\r%@\r]", [self className], self, title, indexIntoTemplate, menuItemIndex, template, [template rightExpressionAttributeType], children];
+}
+
+@end
+