Issue #751168 by elliotttf, caktux, andyceo, setvik, xjm, sun, tim.plunkett: Fixed Regression: Missing 'Default image' per field instance.

Issue #1129642 by jbrown: Fixed Populate HTML image tags with dimension attributes (like D6 imagefield) without re-introducing I/O (followup).

Issue #1028092 by jbrown, chi, eojthebrave , dixon_, justinrandell, Sweetchuck: Fixed critical: Default image is not set to permanent and saved to the wrong schema.

- Patch #1025124 by catch, jbrown: remove cruft from theme_image_style() and image_style_url(). Should be faster too.

- Patch #851878 by justinrandell, flobruit, ksenzee, aaron, litwol: serve image derivatives from the same url they are generated from.

- Patch #353458 by quicksketch, drewish, jpetso, sun, noahb, aaron, chx, mikey_p, dhthwy: hook_file_references() was not designed for a highly flexible field storage.

- Patch #555830 by sun, effulgentsia, mgifford, TheRec, aspilicious: clean up theme_image() to use drupal_attributes() for all attributes and revisit defaults for 'alt' and 'title'.

#746500 by eojthebrave: Fixed Overriding default image styles does not work with more than one effect and has potential to overwrite existing effects.

#713872 by eojthebrave, andypost: Fixed Image field formatters not updated when image style deleted and replacement format chosen.

- Patch #732486 by Damien Tournoud, JacobSingh: drupal_add_http_header()  req ; make Status a normal header and drupal_add_http() header shouldn't return a list of headers.

#679890 follow-up by Bojhan, aspilicious, and agentrickard: Remove more extraneous 'Please' in the interface.