#417774: Add Public FileField API Functions and fix field_file_references() to not be field specific.

Better CSS styling with a line rule to separate the preview and the edit fields. More consistent with existing markup.

#397578: Uncouple ImageField from custom FileField hooks. Implement ImageField as a dependent widget for FileField.

#387194: Major FileField UI Refactoring. Putting File info side-by-side the preview, hiding fields that are unnecessary before uploading a file.

CSS and Markup changes to make it so that clicking upload buttons doesn't cause unexpected wrapping of text when the buttons are floated.

#303286 by dopry, drewish, moonshine, Add field to file during validation so it is available during hook_file_insert.

#362198 by mfb, prettier singleline fix for Undefined class in filefield_widget... doesn't seem like it was committed to head...

#366989 by dopry, fix php notice for Undefined index class.

good catch... thanks.