Simplify make_pairlist() call signature

Simplify make_pairlist() call signature

The nonbonded_verlet_group_t struct is no longer needed now the local
and non-local interactions always use the same kernel types.
This simplifies the make_pairlist() and put_on_grid() call signature.
Removed direct access to kernel and ewald exclusion types from outside
the nbnxn module.
Merged the pruning setup and the transfer of the pairlist to the GPU
into nbnxn_make_pairlist().
Also removed the ePBC argument from nbnxn_put_on_grid().

Change-Id: Id96d7e5aa6ce846e9d38614f7edcdced89687799