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.

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

#781088 Reorganize Content Migrate files for efficiency, and also to make it easier to use the individual module code as examples on how to implement the hooks.

#781088 by Island Usurper, loganfsmyth, and mattbatt, fixes to get imagefield and filefield data migrated.

Rewrote content_migrate to migrate one data record at a time, with a drupal_alter() before inserting it into the new table, to allow fields like imagefields to re-organize the data in the new table.

Add more information to the drupal_alter -- field info when altering an instance and instance info when altering a field -- for settings that are being moved from field to instance or vice versa. Initial attempt to handle the imagefield migration.

#781088 More work on content migrate. Fix allowed values to make them into arrays, to match the new way that lists are stored.

More tweaking of content migrate script, starting to work correctly for at least the cases I have tested so far.

Adding content migrate module. Still needs lots of work, just getting this much committed so it is not lost.