wave_reader: allow FULL input types
Previously, wave_reader locked 'FULL' (3D) input behind enabling restart. This restriction was unnecessary, and doing so in fact made the specification of u/v/w/rho filenames useless. Deleting this check allows proper read-in of FULL datatypes, without faking a restart. The only functional difference is that if perturbations are also enabled, they will be applied on top of the 3D data read. This seems to be desirable, since it makes the application of the config-file settings more straightforward.
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