Seed extractor as storage

Seed extractor in hydroponics can now also be used to store the seeds.

![ayqwvzk](https://f.cloud.github.com/assets/6681708/2309019/bc7dbabe-a2c9-11e3-83e4-81d75d337c52.png)

Seeds can be loaded from the bag or one by one. (When you extract the seeds, they still drop on top of the extractor).

Also makes smartfridges sort their contents alphabetically.