Generation search in PKMDB and/or Batch Editor

[Prayos]

Currently, the PKMDB allows you to search by Generation, but this is by the game the pokemon was caught in. I'd like to request a more advanced generation search based on the actual generation the pokemon was released(i.e., bulbasaur -> mew would be Gen 1), no matter what game the Pokemon was caught in. This could be especially helpful in the Batch Editor if you want to limit the pokemon edited to a specific gen, but all your pokemon are the same .pk type.

[Kaphotics]

use DebutGeneration on the latest commit

https://github.com/kwsch/PKHeX/commit/c751c987a9cf3254366ec2fba56b2647ba22b2ab