Hiero: add ability to change order of effects

For now there is no way to change order of effects but deleting them and then recreating in a new order. This pull tries to fix the situation.
![ordering](https://cloud.githubusercontent.com/assets/1929058/3161219/97bb123c-eb29-11e3-8bf2-0ca8668c7b6a.PNG)

Note: the right panel should get some more horizontal space, but I was unable to achieve this (I'm not familiar with Swing). Please fix it.