rename some test cases because we'll need to test them with LINQ::Iterator too

--HG--
rename : t/10-aggregate.t => t/10array-aggregate.t
rename : t/10-all.t => t/10array-all.t
rename : t/10-any.t => t/10array-any.t
rename : t/10-average.t => t/10array-average.t
rename : t/10-cast.t => t/10array-cast.t
rename : t/10-count.t => t/10array-count.t
rename : t/10-first.t => t/10array-first.t
rename : t/10-first_or_default.t => t/10array-first_or_default.t
rename : t/10-group_join.t => t/10array-group_join.t
rename : t/10-join.t => t/10array-join.t
rename : t/10-last.t => t/10array-last.t
rename : t/10-last_or_default.t => t/10array-last_or_default.t
rename : t/10-max.t => t/10array-max.t
rename : t/10-min.t => t/10array-min.t
rename : t/10-of_type.t => t/10array-of_type.t
rename : t/10-select.t => t/10array-select.t
rename : t/10-select_many.t => t/10array-select_many.t
rename : t/10-single.t => t/10array-single.t
rename : t/10-single_or_default.t => t/10array-single_or_default.t
rename : t/10-skip.t => t/10array-skip.t
rename : t/10-skip_while.t => t/10array-skip_while.t
rename : t/10-sum.t => t/10array-sum.t
rename : t/10-take.t => t/10array-take.t
rename : t/10-take_while.t => t/10array-take_while.t
rename : t/10-where.t => t/10array-where.t
simple script to generate test cases for LINQ::Iterator
very naive implementation of LINQ::Iterator; much scope for improvement; especially select and where