deprecated children_count replaced
removed space before argument parentheses
deprecated count call modified
replaced deprecated human_size by number_to_human_size
deprecated start_form_tag replaced by form_tag
fixed: crash when changing the status of an issue
project settings tabs redesign
* project settings split in 4 tabs * prototype.js upgraded to 1.5.0_rc1
fixed: unable to delete an issue status even if it's not used yet
fixed: setting an issue status as default status leads to an sql error with SQLite
