AlSlotManagerTest removed because it will be rewritten from the scratch
fixed indentation; removed unused code
AlSlotManager has been refactored
updated classes due to AlSlotManager refactor
fixed a bug that adds included blocks to a page when the father slot was not expected to be added; updated due to AlSlotManager refactor
added a new entry in the blocks menu to add a new block above the selected block
a script tag added to a Script block was eneditable: fixed