Coconut, is it a common allergen? Use of Coconut Flour and Oil.

http://www.mercola.com/products/coconut_flour.htm

So I know coconut oil is a great ingredient to use.. But, coconut is considered a tree nut. So is it safe for many with allergies? Is Coconut as dangerous as other tree nuts?
http://foodallergies.about.com/od/nutallergies/f/coconutallergy.htm
http://surefoodsliving.com/2008/12/01/tree-nut-allergy-questions-coconut-palm-oil/

It's said that coconut allergies are far less common than allergies to almonds, cashews and other tree nuts. And coconut flour is a good ingredient for those with milk, nut, and other allergies...
I am allergic to peanuts/walnuts and must avoid them and most tree nuts. However I am unsure of coconut. If I am not allergic to coconut and it is something I could have, using coconut oil and possibly coconut flour may be a very healthy option.