depreciate xpose_data?

[bguiastr]

We currently have xpose_data() for nonmem and xpose_data_nlmixr() for nlmixr. For consistency I am thinking of soft depreciating xpose_data() and rename it xpdb_nm() or xpose_nm() (or other if suggestions) we would then get similar naming for nlmixr e.g. xpdb_nlmixr() or xpose_nlmixr(). Any thoughts @andrewhooker @sebastianueckert, @MikeKSmith , @mattfidler?