DataSeries does not support boolean operators with scalars

[AtharvaKhare]

It is not possible to use boolean operators with scalars.

ds := DataSeries newFromKeys: #(1 2 3 4 5) andValues: #(11 12 13 14 15).
ds > 3.

Doing the above should return something like a DataSeries(1->true 2->true 3->true 4->true 5->true)

Operators not supported include >, <, >=, <= and =.

Also, do these operations need to be compatible with DataSeries as well? (eg: ds1 > ds2)

[AtharvaKhare]

Fixed with #99.