A Bit of a Speed Bump: V3.1.21

We have released a new version of SkyView (V3.1.21) which  includes changes in the way we gather meta data for image generation. When we build SkyView we  now create a single hash file which associates all survey names and aliases with the appropriate survey descriptions.  Thus SkyView only reads the survey descriptions of the surveys  the user asks for. Previously it needed to read the beginning of all ~100 files.  This seems to save about .2 seconds per image.  We have also added a data availability check for AKARI, our new remote survey.