Use GB instead of MB for image sizes
Use GB instead of MB for image sizes

Although there are many images that are in the MB size range, and
some in the KB size range, the majority of our images are in the GB
range. Use GB instead.

Signed-off-by: Patrick Avery <743342299f279e7a8c3ff5eb40671fce3e95f13a@kitware.com>

OpenChemistry/mongochemserver