Issue #1339962 by bdragon, jcisio: Added support for imagefield-based formatters when migrating image fields

Issue #1369658 by SangersDrupalDude, jenlampton: Fixed 'Integrity constraint violation - Column 'uid' cannot be null' if unknown file during filefield/imagefield migration

Issue #1395400 by jalama, zeisilo, yched: Fixed migration of hidden fields causes hiccups when exporting with features

Fix image title and alt and file display settings, which were not getting picked up in the migration.

Issue #1117028 Add messages to the textfield changes. Make an assumption that a text with no maxlength that uses a textfield widget was intended to be a varchar field with a textfield widget. Users can see from the message what will happen so they will not migrate the field if that is not desired.

Issue #1164530 Add messaging system to the content migration process. Display messages on the migration page so users can see, before the migration, what changes will be made to each field and.

Fix some remaining problems from trying to add instance data to the data alter field. Some missing documentation, some missing variables, some incorrectly computed values.

Ensure that text filter formats get set to an allowed value during the migration, borrowing code from node_update_7006().

Issue #1157234, by solotandem and KarenS, additional fix that got left out of earlier commit, remove unneeded clause testing for values that were removed earlier in the process.

Issue #1157234, by solotandem and KarenS, fix process of checking empty records, and some other errors and code cleanup.

Issue #1039466 Add some warning messages if the widget or formatter is missing when the field is migrated, but allow the migration, they will be set to use the default widget and formatter.

Issue #1039466 We need to switch the file module for file and image fields even if they use a custom widget or they will not show up as fields that can be migrated. Best we can do is display anything that has a 'imagefield' or 'filefield' prefix.

Issue #1039466 Make sure number migration code does not break when migrating a field that has a custom number formatter.

Issue #1150790 Make sure empty values are not saved in migration to match bahavior when new empty values are submitted.

Switch the field definition batch to process one field at a time to avoid timeouts on sites with lots of fields.

Issue #1093844 by dww, Fix PHP warnings from content_migrate.filefield.inc on undefined legacy settings.