Refactoring UI in preparation of adding "Upgrade" section.
Show separate list of "upgradable" plug-ins, for quick access to upgrades.
Refine upgradable plugin section.
Fix typo in name.
Add generic way of adding spinner without loading/reset buttons.
Minor fixes to install UI.
Fix init SQL.
Ignore the getBundle() method when serializing, to avoid recursion.
Add support for removing plugins.
Before provision plugins, create a backup automatically.