Added national field to Location to identify groups of regions.
Entry comments are now text fields, they were previously limited to 255 characters.
Removed photos from the model.

Photos were original included as the model was designed to be a general
purpose schema for recording information about birds. The project was
created for Birding Lisboa, a news service covering the Tejo estuary
around Lisbon, Portugal. This project intended to display photos of
interesting birds seen and also build a database of locations to go
birding, which included photos of the sites.

With services like Flickr and more importantly YouTube the need to
store photos in the database is less important. jQuery plugins such
as slimbox, etc. make it easy to integrate photos (and videos) from
different sources into a web site. Also when photos were used in
Birding Lisboa they were displayed as a group, separate from the
report of the species, reducing the need to tie a photo directly to
an entry.
Cleaned up display of the changelist for Checklist, Entry and Detail.