This reverts commit 127b54a6.

Issue #1827448 by RobLoach, sun, jbrown, tstoeckler: Use __DIR__ instead of DRUPAL_ROOT where possible/sensible.

Issue #1808864 by fastangel, Jose Reyero: Fixed Exception handling is not 'locale safe' (thus not database safe).

Issue #1493108 by marcingy, Mike Wacker, sun, kbasarab, Berdir, Rok Žlender, cosmicdreams, alexpott: Convert logging and error settings to configuration system.

Issue #1587858 by apotek: Fixed AJAX alert dialogs respect neither display_errors() ini.php setting or ['error_level()'] setting, exposing server info.

Issue #692366 by underq, bradweikel, willmoy, kid_icarus | foripepe: Fixed Stop forcing language/mirror for PHP manual links.

Issue #334024 by klausi, catch, beejeebus, sun: Use const keyword to define constants instead of define().

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.

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.

Issue #1136130 by pillarsdotnet: Reinstated WATCHDOG_* constants; using PHP equivalents caused issues on Windows.

- Patch #195416 by Damien Tournoud, David Strauss: table prefixes should be per database connection.

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

#742246 by jbrown: Fixed Uncaught exceptions thrown in the exception handler prevent error reporting.

- Patch #732486 by Damien Tournoud, JacobSingh: drupal_add_http_header()  req ; make Status a normal header and drupal_add_http() header shouldn't return a list of headers.