Issue #2461929 by Deciphered: Support sources with _ (underscore) in machine name.
Issue #2088985: Fatal error on line 139 when cURL not installed.
Issue #1936836 by Softwar: Load includes for validation errors.
Issue #2239897 by Matthew Moen: Don't specify a tag in the show/hide selectors.
Issue #2203651 by Jonathan Hunt: Path error messages should specify path.
Issue #1492374 by Dave Reid: Do not show files in the select list that could never be attached.
Issue #1492374 by quicksketch, Dave Reid: Attach source reference existing file where it's the same as source
Issue #661198 by rv0, profak: Add access control/permissions by role.
Issue #454982 by Liam Morland: Reference all filefield files
Issue #2466247 by Chris Burge: Drupal core 7.36 broke Filefield Sources Ajax upload previews
Issue #1795160 by elplatt and Demonick99: An HTTP error 0 occurred when transferring remote files.
Issue #59944: Creating new checks for reusing files between nodes.
Issue #1885324: Use GROUP BY when building existing file lists to ensure files are listed if other files have been referenced more than 30 times.
Issue #1325136: Only print out the token tree if token.module exists.
Issue #1891000 by GeduR: Source: Attach (FTP) file_scan_directory not ported to Drupal 7.
Issue #1853946 by Daluxz: Error attaching private files via IMCE.
Issue #1840028 by jeremyr: Correct typo in attach.inc.
Issue #1936836: Load includes for validation (Fatal error: Call to undefined function _filefield_source_attach_file_path_validate).
Issue #1334378: Insert file on IMCE fails in Internet Explorer (7-9).
Issue #1334378 by amfranco: Insert file on IMCE fails in Internet Explorer (7-9).
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