[DynareDev] k_order_perturbation under Windows

k_order_perturbation DLL works under Windows XP and Octave when compiled under Cygwin (with gcc-4), but it is necessary to add -D_WIN32 when compiling, in order to avoid the dlopen/dlclose functions. If these functions are present, Octave refuses to load the DLL. I'm going to check with Matlab now Best Michel