Fixing a bug where if the register depth was too deep, more properties would not...

Fixing a bug where if the register depth was too deep, more properties would not be fetched/inserted correctly

* Source/AppDelegate.m+h: Add and synthesize props for debugger and breakpoint ivars
* Source/DebuggerConnection.m+h:
(getProperty:forNode:): Renamed [getProperty:] and now return an NSArray rather than attaching to a node
* Source/DebuggerWindowController.m+h:
(addChildren:toNode:): Removed
(outlineViewItemDidExpand:): Don't have to do extra fetch work here because it will now be done in the model
* Source/NSXMLElementAdditions.m+h:
(subnodes): New method that does the same thing as [children] but intelligently fetches more depth
* English.lproj/Debugger.xib: Tell the regiser NSTreeController to use [subnodes] instead of [children]