Correct ivars release.

Apple advises against using accessor in init and dealloc. Directly use ivars.
Fix a memory problem
Memory management improvements

Checked thoroughly that retained instance properties are correctly released.
Set delegates to nil on dealloc

Safety measure
Prevent ASIHTTPRequest’s leaks

Use our connection queue management for all asynchronous requests.
For synchronous requests, make sure to call -clearDelegatesAndCancel before request release.
Fix a memory leak
Make the helper function percentEscape easier to use

This fixes memory leaks in use of it in GoogleReader
Try to hide some private properties or protect them
Optimize memory use by reclaiming it
Use a more modern exception handling technique
Make sure ArticleView loading is stopped
For safety : in dealloc set released ivars to nil
Remove apparently useless code
Make sure folder is stable before we get articles

Might solve issue #285
Move some logic to ArticleController (fits better)
Make UnifiedDisplayView refreshes more pleasant.

No need to refresh current folder at the end of the refresh queue, since it is already refreshed when the current folder has finished being refreshed, thanks to the MA_Notify_ArticleListStateChange notification
Memory management improvements

Make sure objects added to NSMutableArray’s and NSMutableDictionary’s are autoreleased before being added
Change dict & array properties to copy instead of retain

To limit risks of objects being cyclically retained
Simplify WebFrame parameter management

No need to pass a newly allocated & retained string to the WebFrame
Fix the UnifiedDisplayView responder