* bugfix in case exif method with latlon finds no single image.
1.6.12
* Fix for brutal error when no valid input directory is given as input.
1.6.11
* name convention: `store_to_disk `into `use_image_cache` * Add `use_thumbnail_cache` for creating and loading thumbnails. * Fixed bug for unique plotting * Fixed a bug in scatter and and updated parameters for pca usage
1.6.10
* Performance upgrades for EXIF information processing. * Implemented parallel processing for EXIF information. * `store_to_disk` parameter now also stores thumbnails to the user-temp which speeds up image plotting. * Code refactoring
1.6.9
* Fix for when using exif and datetime seconds is off