Revert NCBI Linkout stats deposition.

This reverts commits ec3f50fa6294ba08c632b3e2f3b641c57e00e27a, 43dea5ae70235bb4d7772794dfbac6da46ad65bf, 84db2babcdee8402301ecd18635490a05a90de84, and b99541fb9437913046d0348bfdcf6d419e640e81, which are now moved to datadryad/dryad-data.