File class: hash, time

* Added time to hash sequence to ensure file uniqueness
Database model, old code

* Dropped old image save code from database model
Image thumb, recycling

* Added support for image thumb recycling
Images, models

* Added support for new file to Attr and Database model
* Fixed bug causing thumbs to regenerate every time
* Fixed thumb logic
Images, Thumb dropping

* Thumbs are dropped on image/file drop
Urls, seoname numbers

* Seonames can contain numbers
Files, from_form

* Added support for files to forms