flag 7.x-2.1

Changes since 7.x-2.0:

• #1355864 by joachim, socketwench: Added a Views sort handler for flagged / unflagged.
• #1792584 by joachim, scor: Fixed flag links displayed twice on user profile.
• by joachim: Added API docs for hook_flag_export_alter().
• #1734550 by pebosi: Removed unused form property '#flag_link_fields' and helper function.
• #1877290 by csdco: Fixed flag_init() not using module_load_include().
• Revert "Issue #1304790 by fago: Fixed flagging-user sub-tokens not replaced."
• #1304790 by fago: Fixed flagging-user sub-tokens not replaced.
• #1817644 by barraponto: Added flag template suggestion for link type.
• by joachim: Changed variable name.
• #1817010 by joachim: Fixed typo in array property in FlagRulesUIClass.
• #1475040 by socketwench, drupalmonkey: Fixed inconsistent declaration of flag_node()::type_access_multiple().
• #1351124 by naxoc: Fixed undefined index in flag_get_content_flags() when the given entity has no flaggings.