Bug fix to prep_satellite for case when no retrievals found within +/-2 SD of mean and update to prep_regions for satellites for compatability with new version of FPv10.4 for satellites

Change to calculation of eigendecomposition of prior error covariance to only calculate eigenvectors for the kept eigenvalues

changes to find median solution for log-normal PDF in state space and changes to reading of prior fluxes

updates for lognormal inversion to include influence on mixing ratio from ocean fluxes when these are not optimized

Updates to be able to use footprints at regular release times and changes to make global grid map with a zoom region