BIG update!

After more than 3 years since the last release, here is a new version with a LOT of new features.

Compound tags: define tags based on tag queries
Fully translated interface: English, French, and Esperanto
GIFs are now animated
Compare images (based on difference hashing)
Move several files at once
Execute pattern-based replacements on image paths
Replace a tag by another on all concerned images at once
Integrated SQL console
Tags suggestion in query field and image editing dialog
Directories can now be dragged and dropped
Special tags now support regexes
New special tag path: queries all images whose path matches the value
New special tag similar_to: queries all images that are similar to the specified one
New special tag joker ? in plain text mode: matches 0 or 1 character
Resizable image preview in image editing dialog
Query images without any tags
Export selected images as a XML playlist
Sortable tables in tags editing dialog
Using system icon theme on compatible Linux distributions
Change database file from within the application
Database auto-updates
Context menus in tags tree and image lists

Special tag type renamed ext
Special tag values now require double quotes " for plain text mode (only available mode in previous versions)
- No need to escape spaces anymore
Single error message when several image could not be deleted instead of individual ones
Directories are now loaded recursively

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