Issue #1870612 by David_Rothstein, plach, greggles: Add tests for SA-CORE-2012-004 - Drupal core - Arbitrary code execution via file upload.

Issue #966210 by mfb, catch, drumm, bfroehle, drewish, makara, sun, BTMash, iamEAP: Fixed DB Case Sensitivity: system_update_7061() fails on inserting files with same name but different case.

Issue #278425 by andypost, droplet, OnkelTem, chx, c960657, drewish, kotnik, realityloop: Change notice for: Using basename() is not locale safe.

Issue #1183430 by TR, oriol_e9g: Fixed t function strings should not have whitespaces at beginning or end.

- Patch #1239376 by Dave Reid: .ogg file extension incorrectly mapped to 'application/ogg' in file_default_mimetype_mapping().

#930122 by dww: Regression: temp directory handling broken by confusion between file_directory_temp and file_temporary_path.

- Patch #924554 by quicksketch, paul.lovvik: an exception is being thrown in the file_usage_delete() function if the corresponding file is not in the 'file_usage()' table.

- Patch #353458 by quicksketch, drewish, jpetso, sun, noahb, aaron, chx, mikey_p, dhthwy: hook_file_references() was not designed for a highly flexible field storage.

- Patch #443286 by c960657, Damien Tournoud, drifter, webkenny, scor: international characters break file handling.

#500866 by boombatower, solotandem: Remove t() from assertion messages in SimpleTest, so translators do not get 1000s of bogus strings.

- Patch #693084 by dhthwy, jpmckinney, reglogge, clemens.tolboom, naxoc, chx: file_munge_filename() extension handling broken by move to File Field.

#551658 follow-up by pwolanin: Revert back to D6-style temporary folder logic to avoid various platform issues.

- Patch #701358 by aaron, quicksketch, chx, pwolanin, aspilicious: the file API presumes a hiearchical file storage.

- Patch #777830 by Wim Leers: file_create_url() does not support protocol-relative nor root-relative file URLs.

- Patch #348448 by mfb, c960657, marvil07, cdale, jpmckinney: fixed PHP strict warnings when running tests and for PHP 5.3.

- Patch #741578 by nikgregory, andypost, Berdir, noahb: 'File' is a reserved word that should not be used.

#653940 follow-up by Damien Tournoud: Clean-up of error handling from first stab at test reporting fixes.

#606526 by axyjo and scor: Remove trailing whitespace and add newlines at end of files. Sorry, folks! But it is after code freeze. :)

- Patch #331171 by pwolanin, mfb, drewish: allow modules to alter the MIME extension mapping rather than setting a huge variable.