The unofficial vdos2sab exclude flag not reflected in python interface

[tkittel]

People developing coherent single-phonon plugins, might try to use our unofficial workaround:

@CUSTOM_UNOFFICIALHACKS
  vdos2sab_ignorecontrib 1 1

However, this hack is applied only in the std scatter factory, so loading an info object and trying to invoke .loadKernel there, will not reflect this change.

We should perhaps consider moving this hack to NCDynInfoUtils.cc, and letting the DynInfo look at the parent Info object for @Custom sections?