add a bit more explanation to the core_model
add a bit more explanation to the core_model

FreedomCoop/valuenetwork,simontegg/valuenetwork,django-rea/nrp,django-rea/nrp,simontegg/valuenetwork,thierrymarianne/valuenetwork,valnet/valuenetwork,valnet/valuenetwork,FreedomCoop/valuenetwork,thierrymarianne/valuenetwork,valnet/valuenetwork,valnet/valuenetwork,thierrymarianne/valuenetwork,django-rea/nrp,FreedomCoop/valuenetwork,simontegg/valuenetwork,FreedomCoop/valuenetwork,django-rea/nrp,simontegg/valuenetwork,thierrymarianne/valuenetwork