appbar 6.x-2.0-alpha2

This is a maintenance release. I'm creating it because alpha1 is a lot buggier. While the module at this point seems to work well for most people, I'm not happy with parts of the implementation, and so I will be changing the API. That's why this is still in alpha.

Changes from 6.x-2.0-alpha1

#827650 Duplicate alert
#857974 Breaks ajax_comments.module in FF and IE
#854068 Unnecessary requests
#829048 Improve batch processing performance for sending messages to all users
Add a "[configure block]" link that appears on mousing over the control bar of block popups
Make popover block content align better with the subject on the bar
Added an option to turn off the alert system
#884282 Move appbar block settings fieldset lower on the form
#871430 Incorrect config link if Drupal isn't installed at document root
#819584 Don't change the context variable in jQuery
#949934 Add support for assigning blocks to appbar using the context module
allow "hover" block state