Fix T37897 copy properties operator freeze blender

the script was checking for selected strips one by one,
and sometimes this drives into freeze (can't explain why, but its obviously
a bad way to do it...

now it uses context.selected_editable_sequences, now it is more efficient
and the bug seems to be solved.
Updated add-on to support the new tabs in the Tool Shelf.

The Edit Linked Library panel now only appears in the Relations tab
AnimAll: Place in animation category (duh!)