Drupal 7 upgrade. Unstable.
- Expire files returned by FeedsImportBatch after DRUPAL_MAXIMUM_TEMP_FILE_AGE seconds.
- FeedsFileFetcher: track uploaded files, delete unused files.
- yhahn: Upgrade FeedsTaxonomyProcessor.
- Remove handling of target items that are array. All target items must be
- Upgrade file and image mapper.
- Upgrade taxonomy mapper.
- Upgrade field mapper.
- Move plugin handling into FeedsPlugin class.
- Base level upgrade.