Improved tag support. Now tags are stored as array on the db.
Improved tags graphics.
Added a reset.css.
Improved tag graphics during tag insertion.
Extractor graphics is now automated. This simplifies a future refactoring.
Refactored some code.
Removed the keywords parameters when unused.
Wrong variable was used.
Hash was used instead of original_hash.
Refactored some code for cloning.