MDI images upside-down for certain dates

[dpshelio]

Originally reported by: David PS (Bitbucket: dvdgc, GitHub: Unknown)

---

MDI images are shown upside-down on single-image but not on thumbnail
eg. http://www.solarmonitor.org/index.php?date=20070825

A careful re-population should solve it.

---

• Bitbucket: https://bitbucket.org/solarmonitor/solarmonitorphp/issue/12