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.

Issue #520106 by JohnAlbin, pillarsdotnet, chx, sun, drifter: Fixed No way to dynamically set active trail.

- Patch #1272686 by Paul Simard, bfroehle, beejeebus: convert existing cache_* calls to the new cache()-> API.

Issue #898634 by catch, alex_b, chx: Fixed install_drupal(): call to menu-touching functions results in SQL syntax error.

- Patch #1001146 by edhaber, droplet: cannot theme links in a menu when menu_name() contains a hyphen.

- Patch #965272 by larowlan, bellHead, TR: items defined with type MENU_CALLBACK show 'Home' as a title.

- Patch #997918 by David_Rothstein: menu gets rebuilt continually during install and update (and menu system stores entire, out-of-date theme objects).

- Patch #749992 by jhodgdon: menu system / menu module distinction is not obvious to folks new to Drupal.

- Patch #669510 by quicksketch, David_Rothstein, Dave Reid, casey, Gábor Hojtsy, mrfelton, effulgentsia: merge administration theme with hook_admin_paths().

#550254 by Damien Tournoud, sun: Fixed some causes of menu links are sometimes not properly re-parented.

#599706 follow-up by JohnAlbin, sun: Regression: Restore consistency to theme_menu_local_tasks() theme function

- Patch #944198 by sun: functions that call drupal_system_listing() act on potentially invalid system items.

#553944 by sun: Define hook_menu_get_item_alter() as a reliable hook that runs before the page is generated.

- Patch #943558 by David_Rothstein: 'block_callback()' in menu_router() table seems to have no purpose.