Issue #1326664 by Lars Toomre, Albert Volkman, sven.lauer, tim.plunkett: API docs cleanup for parts of system module and other files

Issue #1540174 by Niklas Fiekas, attiks: Fixed Some attributes not allowed for the new HTML5 input elements.

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.

- Patch #561708 by jurgenhaas, gleroux02, ksenzee, Island Usurper: theme_image() chokes if getimagesize() fails.

before a form builder function, to facilitate common form elements. Clean-up
from form_builder changes from CTools patch. Has nice side-benefit of making
all form functions' signatures consistent.

#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://.

- 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.

- Patch #252013 by Eaton, pwolanin, Susurrus et al: drupal_render() now printes #markup, not #value.

- Patch #270508 by paul.levvik and pwolanin: usability improvement: image toolkits should not have to be copied.

- Patch #245115 by kkaefer, John Morahan, JohnAlbin et al: after a long discussion we've decided to make the concatenation operator consistent with the other operators.

#201540 follow up by zoo33: move jpeg quality validation to where it belongs, so it is only called if the current image toolkit requires it

 - always include CVS Id tags in all files
 - add a new line after the CVS Id, if more code or phpdoc follows in the same code block
 - fix bogus Id tags previously added

- Patch #148346 by Steef and drewish: split image.inc into image.inc and image.gd.inc and improved the documentation.