Issue followup #1579810 by SeeSchloss, Albert Volkman, claudiu.cristea: Remove t() and format_string() from toolkit tests.

Issue #2002650 by mrsinguyen, chertzog, legolasbo, Erik Erskine, rhm50, sandergo90, grisendo, targoo, janstoeckler, maximpodorov, beowulf1416: Improve maintainability by removing unused local variables.

Issue #1903346 by Berdir, tim.plunkett, EclipseGc: Establish a new DefaultPluginManager to encapsulate best practices.

Issue #1930020 by dawehner, Berdir, olli: Inject a class into the Core annotated discovery implementation so that namespaces can be updated.

Issue #1664844 by alexpott, cweagans, heyrocker, eojthebrave, ACF, Berdir: Convert image toolkits into plugins.

Issue #1373142 by sun, beejeebus, aspilicious, amateescu: Use the Testing profile. Speed up testbot by 50%.

Issue #1273478 by BTMash, Alan Evans, kathyh: Allow tests to declare 'requirements'; fail tests where requirements are not met.

Nate Lampton authored Oct 30, 2011 and catch committed Nov 01, 2011

Issue #22336 by quicksketch, scor, boombatower, and rfay. Move all core Drupal files under a core subdirectory.

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

#497118 by chx, catch, pwolanin, JoshuaRogers, and Jacob Singh: Remove the function registry. While the hope was that this would result in improved performance for low-end hosts, it comes at the expense of critical development experience problems and less benefit than something like APC. Class registry remains intact to facilitate autoloading.

Of all the patches to accidentally commit without a message. :( Rolling back registry rip. Let's try that again.

#517814 by jmstacey, justinrandell, pwolanin, drewish, Jody Lynn, aaron, dopry, and c960657: Converted File API to stream wrappers, for enhanced private/public file handling, and the ability to reference other storage mechanisms such as s3:// and flicker://.

#376129 by boombatower, Damien Tournoud, and chx: Change getInfo() to a static method to reduce memory footprint of SimpleTest.

- Patch #373613 by drewish, quicksketch: working around some Debian issues.  They ship a different GD library.

  times (such as crop, scale, then desaturate) without quality loss, we need to
  pass images by their raw GD (or other library) resources rather than re-opening
  the same image repeatedly, which causes wasted processing and loss of quality when
  using JPEG images.  This patch reworks the image toolkits, adds some new image
  manipulations and adds some impressive SimpleTests.