Enforce unique image hashes
Numeric helper functions
si_size: handle invalid values better, guess base
hex2bin: Better error handling
New string helper function
Rounding fix in human time formatting
HTTP status code library
Bug fixes in image viewer template
Array helper functions
Migrations script works with ImageMagick or GraphicsMagick
Change how debug mode works
Make database connection initialiser public

and refactor it slightly
Accept object attributes in prepared statements
Wrap unlink()
Refactor directory prefix creation
Grid viewer respects borders

- Substract border width from thumbnail dimensions
- Better configuration key names
Refactor image browser
Fix empty image tags
Drop keyword as image ID in favour of hash
Allow fetching invalidated users