curve/curvefs_python/HOWTO.md

1. curvefs.py and curvefs_wrap.cxx are generated by command swig -c++ -python curvefs.i.
2. Revert ListDir and Delete Opendir/Closedir functions in curvefs.py if you don intend to make changes about these functions.
3. Revert _wrap_Read/_wrap_Listdir/_wrap_GetClusterId/_wrap_CBDClient_Read/_wrap_CBDClient_Listdir if you don intend to make changes about these functions.
4. ❗ C functions in libcurvefs.h are not recommended for use anymore.
5. ❗ Types in curve_type.h are different from include/client/*.h even they have the similar name.