Don't assume display_settings[$context] always exists, newly enabled modules may add new contexts that weren't there when the field was last edited.

#336174 (followup) Make sure content_view_field() and content_format() both respect field access rules.

#336174 Move actual field access check in content.module, with content_permission.module providing one permission-based implementation.

#331995 Fix 'invalid argument for foreach' warning on nodes with inexistent type. (#327715 followup - content_types() *always* returns a non-array, so testing "if ($type =  content_types($foo))" is useless

#329447 - add api function to display a single field, fully themes with label and multiple values, to be used by 3rd party code.

- a few relationship-safe fixes after merlinofchaos had a look a our code :-)
- a little refactoring to make content_handler_field / content_handler_field_multiple articulation clearer.

Fix bad logic in testing content version variable to prevent warning messages before content module is updated.

#300368 Add option on Display fields screen to omit fields or groups from the $content value, rework theme into content_exclude() which only returns TRUE or FALSE.

#300368 Add option on Display fields screen to omit fields or groups from the $content value passed to the node template.

Get rid of helper function content_is_updated(), we can do it better using the content version variable.

#318227 Clean up update abort logic to more clearly explain what still needs to be done, add a helper function to prevent dangerous database operations until database is updated.

#107407 by dopry, optimization patch, do nothing in hook_form_alter() and hook_nodeapi() if there are no fields.

#314986 by moshe weitzman, remove hook_devel_caches(), deprecated in favor of content_flush_caches().

Added the #delta value to the wrong place in the element, it was inaccessible to the formatter theme.

#310219 Let modules expose additional display modes iunder the 'Display fields' tab : hook_content_build_modes().

- #119102 Combo field prep, add hooks to the fieldgroup module so other modules can alter group info. Add group_type information to the Manage fields screen.

#119102 Combo field prep, add a helper function that can determine if a field is in use and the max delta value in use.