fixes #176: hold a search geometry when readded vi the menu
Merge branch 'feature/176-hold-search-feature-when-re-added-via-menu' into dev
#173 two downloads were imported
#173 PixelDPICalculator was imported
#173 added jai-imageio to pom, to be able to save tifs
#173 FutureImageDownload: remove transparancy of images only if it should be saved as jpeg