pour liquids into containers on ground

Pour some liquid from inventory to near tile with *containers*.

* Old behaviour: liquid pours on ground.

* New behaviour:
![pour](https://cloud.githubusercontent.com/assets/6351438/3560592/a6fd3758-0978-11e4-88db-05ca3879d187.png)

upd: interface and behaviour changed. Look in comments for info.
Thank you, BevapDin. I'll cure it.