Generic Thermostate - Allow tolerance to be linked to entity_id

Hi there,

Following on from my previous topic, it would also be nice to be able to link the cold/hot tolerances to an entity_id, rather than a hard-coded number.
I.e. a heating positive and negative delta will be vastly different to a cooling delta.
Same goes if your changing the tolerances in a zone between night/day, where during the night you can allow for a greater negative delta and decrease the positive delta.

Cheers!