4.0beta

Beta-release of the 4.0 version

Changes:

1. featured images that do not fit on the screen with the fixed height are now shrunken to maintain the aspect ratio
2. better image delete-link in image manager
3. made the location of the admin menu optional between settings or sidebar
4. refresh the admin image manager after uploads
5. better formatting for the admin settings help text
6. made deletion of images on uninstall optional
7. auto-select sample shortcode in admin screen
8. EXIF/IPCT/XMP data can be chosen individually
9. automatic post assignments of tags based on EXIF/IPCT keywords
10. automatic post assignments of hierarchical categories based on EXIF/IPCT location info
11. featured images can now be latest and random images of the given set
12. various fixes