Look into recovering overwritten solutions

[atesgoral]

Prior to the naming convention of including the author in the filename, we had been accepting PRs that simply overwrote existing solutions. It could be very tedious task, but it would be nice to recover old solutions (especially the "normal" ones).

[nanashi-juanto]

I'm under the impression that unbloated "normals" stick very close to the par numbers. Every level, except the ones in the Wish List, has such a solution.