#197722 by catch, hwsong3i: remove 4.7 to 5.x updates; we only support direct updates from 5.x to 6.x

- Patch #174226 by keith.smith, pwolanin et al al -- and greatly simplified by me: added a copyright notice.

#181195 by hunmonk and Pasqualle: node type related variables were not properly renamed, when node type names changed

#200921 by Pancho: code consistency change, renaming an internal variable in drupal_get_schema() for better developer docs

#194579 patch by pwolanin: clear filter cache when allowed HTML tags configuration changes in an input format

#202925 report by beholder, patch by myself: (notice fix) only consider languages with a host set when comparing with the current host in domain language negotiation

#199241 by bjaspan, Heine: fix documentation on how confirm forms are constructed; port of Drupal 5 fix

#201055 by JirkaRybka, scor: avoid duplicates in stats when page caching is turned on or node title is modified

#172993 by drewish, Lynn: remove old user picture even when the newly uploaded one uses a different format

#201479 by chx, ximo: forum module requires taxonomy for uninstall but taxonomy might be disabled at that time, so we need to include it

#186546 by bjaspan: fix missing forum vocabulary when people turned on forum module, but never visited any pages in Drupal 5 and they upgrade to Drupal 6 which does this much better

#201577 by Pasqualle: let the admin theme be configured even if it is disabled (mirror blocks admin behavior)

#196630 by yched: postpone warning message display until batch finished, so messages are not forgotten on non-JS batches

#201536 by chx: centralizing permission checking code in node revision handling, removing lots of duplicate code

#164510 by yched, KarenS: move node batch operations to node.admin.inc for performance and fix a buggy message

#196535 by sun, chx, dww: check whether Drupal can issue HTTP requests at all, so we know that this is the cause of problems, not the remote host not responding.

#200185 by Pancho: truncate_utf8() was abused as if it was an UTF-8 character based string function, so align our code to that. Can be renamed to drupal_truncate_chars() in Drupal 7.

#162788 by dww: allow contrib update_status to provide information on disabled modules and themes too