Bug: the default filter setup had the wrong filter delta for the linebreak filter. Now it matches updates.inc.

  I rewrote this patch for simplicity.

- Patch #11530 by Frodo: fixed long filter tips.

- Patch #9292 by Gerhard: fixed another array_merge + PHP5 woe.

- Modified patch #10613 by killes: generate a 'page not found'-page when a requested node does not exist.  I modified the patch to avoid duplicate 'not found'-checking in the second bulk.

- Patch #11271 by Ber: fixed form_radios() to generate valid XHTML code.  This makes the code generated by the poll module XHTML compliant.

- Similarly, I updated form_checkboxes() to generate valid XHTML code.

- Patch #11298 by nato: the function _forum_topics_read was not returning only nodes of type 'forum' resulting in the forum overview listing counting all node types as topics; attached patch modifies queries to return counts of only 'forum' type nodes.

- Patch #11431 by Gerhard: made sure no empty strings are exported + replaced some double quotes by single quotes.

- Bugfix: provide an absolute URL to the 'ping servers'.

- Orphaned the node_link() hook as per #9769.

- Code improvement: removed some redundant code from the book module.

- Fixed critical bug #10664: made comment in collapsed mode work.  One more down.

- Patch #11426: the forum module generated an empty table for forums with no child forums.

- Fixed bug #11405: unchecking the "publish" box in the default workflow admin page (admin/node/configure/defaults) did not cause the default workflow to change.  This was caused by the fact that node_validate() forced the value of the status field to "1".

- Bugfix: the filter tips contained a non-existing ID which resulted in invalid XHTML code.

- Bugfix: the filter module generated an empty <ul></ul> (= invalid XHTML) when no filter tips are present.

- Patch #10613 by Gerhard: calling a non-existent username or user ID in the blog module URL now returns a 404 error instead of an empty blog page.

- Patch #4925 by erikhopp: comment module emits too many id="comment"s, so the comment form's one has been renamed to 'comment-form'.  This is also more consistent with the 'node-form' one.

   + Made error strings in blog.module consistent.
   + Explained a bit better what the RSD setting is for in the blog module.
   + Removed the notes about PHP content from block module and book module, since everything is handled via the input formats now.

- Bug #10530: added a missing period to a sentence in the help text.

- Patch #11179 by stefan: fixed broken URL in context sensitive help.

- Patch #11388 by pss0ft/Stefan: fixed time offset bug in archive module.

- Reintroduced the book outline feature: non-book pages now have an outline-tab on their node page, given you have permission to maintain books.  Using the outline-tab, nodes can be added to a book's hierarchy.  Also added some context sensitive help and fixed some quotes.

- Patch #11375 by Robert Douglass: removed redundant 'global $user' from forum_insert().