_apply_index with multiunion

[Bug Importer]

Unindex._apply_index still don`t use multiunion for the range search in the trunk.

for 'or' operator may be usefull
def multiunion( seq ):
   if not len(seq):
       return seq
   return reduce( union, seq )

[Hanno Schlichting (hannosch)]

This probably applies to the lines:

for k, set in setlist:
    if isinstance(set, int):
        set = IISet((set,))
    r = set_func(r, set)

If this is a range search and the "if operator=="or": set_func = union" has been set, this could do a multiunion instead of a for loop and a union.

[Hanno Schlichting (hannosch)]

This has been fixed in the recent ZCatalog work.