A bug is in i0.cpp,i1.cpp, k0.cpp and k1.cpp.
In these .cpp files, They need the chbevl function.
So I write a "chbevl.h", and include it to "chbevl.cpp"
and cancel the "chbevl function" in i0.cpp, i1.cpp,
Originally submitted by LI Chuanjun to me.