minor revision of the landmask method, added possibility to give the lat/lon domain explicitly and added cutoff option; updated init method to skip double-saving the data and time domain; added spatial_mask method; revised the sh method to consider only valid time entries and propagate the descriptor; in the imagesc, added option to skip the center-resample operation; in the mod_sh_ana function, added output with warning message
minor revision of the landmask method, added possibility to give the lat/lon domain explicitly and added cutoff option; updated init method to skip double-saving the data and time domain; added spatial_mask method; revised the sh method to consider only valid time entries and propagate the descriptor; in the imagesc, added option to skip the center-resample operation; in the mod_sh_ana function, added output with warning message

jgte/orb,jgte/orb,jgte/orb,jgte/orb,jgte/orb