Returns the folder that the synapse snapshot functions use when no root is
given: the crantr.synapse_snapshot_root option if set, otherwise
syn_snapshot in the user data folder for the package (see
tools::R_user_dir()).
Returns the folder that the synapse snapshot functions use when no root is
given: the crantr.synapse_snapshot_root option if set, otherwise
syn_snapshot in the user data folder for the package (see
tools::R_user_dir()).