Issue #2120205 by mikeryan: Fix bug when upgrading lastimported from D6 to D7
Issue #2109821 by Jelle_S: Handle multi-value subfields in the default field handler
Issue #2039649 by JvE, mikeryan: Smarter setting of file 'type' field
Issue #2106925 by lee20: Fix machine_name generation for legacy migrations
Issue #2102087 by mikeryan: Don't pass --group to drush subprocess
Issue #2099585 by mikeryan: Enable group option on drush migrate-stop
Issue #2088255 by fuerst: Eliminate notices on migrate_map_hash with track_changes
Issue #2014849 by fuerst: Make sure (again) statistics properly default to 0
Issue #2042535 by mikeryan: Properly set file_usage for user pictures
Issue #2065295 by mikeryan: Add ability to disable other module's hooks during migration
Issue #2060631 by mikeryan: Fix notices on poll vote import
Issue #2051547 by mikeryan: Add ability to revert UI-defined field mappings
Issue #2049689 by mikeryan: Empty values for node is_new caused SQL errors
Issue #2042399 by Luxian: Node import did not respect revision flag
Issue #2034885 by JeremyFrench: For XML sources, don't override values populated in prepareRow()
Issue #2041267 by Chi: Handle lack of potential dependencies on edit page
Issue #2040101 by Dave Reid: Fixed Breadcrumbs in migration UI missing sections.
Issue #2033947 by mikeryan: Empty migration display names when matching group names
Issue #2037265 by Dave Reid: Run static registration whenever a module is enabled that implements hook_migrate_api().
Issue #2021457 by capynet: Coding standard improvements for xml.inc
Issue #2030559 by mikeryan: Add deprecation messages for arguments()
Issue #1854382 by Luxian: Fix handling of terms with leading spaces
Update CHANGELOG for 2.6 RC1
Issue #2025137 by Luxian: Ignore --update in the presence of --idlist.
Issue #2023813 by capynet: Apply defaultValue() for empty XML values
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