* Added some missing signal disconnections

	* Added some missing signal disconnections
	* Added some missing unref's
	* Fixed some UI dimming rules
	* Moved a signal disconnection from finalize to dispose
	* Fixed the problem of signal disconnections when the MainView is closed
	* Added a handler that clears the header view if the account is removed
	* Account Management rewritten
		* Added some new signals to notify accounts insertions,deletions and changes
		* Removed the old notification stuff
	* ModestTnyAccountStore rewritten
		* Accounts are inserted and deleted one by one
		* Improved the MMC account management
		* Uses TnyList instead of GSList
		* Removed several functions due to code refactoring
		* Added the proper handlers to the new ModestAccountMgr signals
	* Moved some account functions to their proper places
	* Improved ModestConf notification system
	* Removed the fake notifications in ModestConf
	* Rewritten the ModestTnyLocalFoldersAccount
	* Added handlers to ModestFolderView to track account changes
	* Added handlers to ModestHeaderView to track account changes
	* Added several proper signal handler connection status detection (no longer uses "> 0")
	* Added some missing checks in the ModestTnySendQueue
	* TODO:
		* check that the gconf changes are really working
		* account changes are still not detected (think about how to do it, without having to listen for gconf changes)
		* The MainView paned position is not persistent

pmo-sessionwork-r2838