Added Pancakes + Repaired Potassium and Phosphorus quantities in plants

I have added too much commits (I wated to add 2 pull request: one for Potas. and Phosp. quantities change and one for pancakes, but I didn't know that I will have to pull all commits at once so I have splitted this into 2 sections to explain all commits.

I have added Pancake and Jam to food recipes. I have added it just
because i need to start coding somewhere and this looked like a nice
opportunity to learn new things. Pancakes are fully tested and works,
with no bugs found. 
Thanks to Spheretech for sprites


I have halfed quantities of ptassium in potatoes and phosphorus in
pumpkins. Now there is about 1-2 units in normal plant...