OpenCyto.js :
modified the logic to manage the state of the 'check all' checkbox to 1) not throw an error, if the table is hidden/not rendered and 2) not rely on the checkboxmemory plugin to work correctly (the proper checking function is now also triggered each time a grid's view is refreshed)

OpenCytoPreprocessing.js :
- abstracted the usage of the 'x-item-disabled' class into a separate method
- removed the usage of the Checkboxmemory plugin
- logic of publishing the analyses-reload 'event' cleaned up not to get triggered each time a grid is filtered or sorted
- cleaned up some logic that became obsolete