highorder difference in OpenFOAM
Hello,
I want to implement a highorder difference sheme which is 4 or 5 order, but it seemed that the difference order is just up to 3 order, the difference template in OpenFOAM now is just two cells, but the high order（4or5） will need more than 3 neighbor cells, so who can tell me how to implement the high order difference with the smallest modify with the current C++ code? 
Hello, i tried to implement highorder schemes in OpenFOAM (WENO + kexact) one year ago, but i found, that i don't know how to select proper stencil for scheme. If You will help with mathematics, then i can help you with implementation

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