Revert "Fix: sort_positions_... -> _sort_positions"

This reverts commit 50ea80e8d0e4c67ed176be1cadabfbddf8e07ffe.
Revert "Add smaller vasprun.xml"

This reverts commit d135f683a3019f6eeea3e406e570bfcf176fb129.
Revert "Remove vasprun.xml because it's too large"

This reverts commit 06904bf1137ec334bcc2bc678c845b57e06dd135.
Revert "Add an example of MAGMOM tag"

This reverts commit 3a581264b7e8df9d55883a972adf2d534087c1f5.
Fix: sort_positions_... -> _sort_positions
Add an example of MAGMOM tag