Expansion means here that the dimensions of x are expanded acordingly to ref. Please note that
this is really only about expansion. In the case that one dimension of ref is smaller than of x nothing
happens with this dimension. At the moment magpie_expand is only internally available in the magclass
library
You can influence the verbosity of this function by setting the option "magclass.verbosity". By default
verbosity is set to 2 which means that warnings as well as notes are returned. Setting verbosity to 1 means
that only warnings are returned but no notes. This is done by options(verbosity.level=1)
a <- new.magpie(c("AFR","CPA"),"y1995",c("m","n"))
b <- new.magpie("GLO","y1995",c("bla","blub"))
magpie_expand(b,a)
options(magclass.verbosity=1)
magpie_expand(b,a)