Issue #1049462 by rfay: Fixed Usage of deprecated form_state['clicked_button'] causes bugs during AJAX submissions by non-buttons.

#932846 by bfroehle, dww: Fixed authorize.php connection settings form broken (doesn't degrade, pointless fieldset)

#686060 by Crell, David_Rothstein, dww, yoroy, carlos8f, et al: Fixed Explain that the Update manager only works if you have FTP or SSH access to your server

#609772 by dww, JacobSingh, ksenzee: Fixed Impossible to extend the FileTransfer class system in contrib

#688294 by Berdir, andypost, Crell, catch: Fixed Switch from db_is_active() to proper exception catching.

#679890 follow-up by Bojhan, aspilicious, and agentrickard: Remove more extraneous 'Please' in the interface.

#607008 by dww, Gerhard Killesreiter, JacobSingh, and chx: Changed Fix bugs in https support and use  https for authorize.php if available.

#605920 by dww and Bojhan: Fix all buttons in update manager workflow to use 'Sentence case' labels.

- Patch #605344 by dww: documentation and code style fixes for update manager. This was ready before freeze.

#538660 by JacobSingh, dww, JoshuaRogers, adrian, Crell, chx, anarcat, and cwgordon7: Add a functioning Plugin Manager to core. Can you say module installation and updates through the UI? I knew you could! :D