Merge some documentation changes.

Merged revisions 48927-48930,48934,48938 via svnmerge from 
https://svn.boost.org/svn/boost/trunk

........
  r48927 | danieljames | 2008-09-23 20:29:01 +0100 (Tue, 23 Sep 2008) | 5 lines
  
  Rewrite the id code to convert the characters of parts of the id at the time of
  generating the id. This means that characters are translated to underscores for
  ids as well as for filenames, since in the eventual documents they have to be
  percent encoded this is probably an approvement. It also lets us deal with the
  translation more intelligently and truncate long identifiers.
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  r48928 | danieljames | 2008-09-23 20:42:06 +0100 (Tue, 23 Sep 2008) | 1 line
  
  Copy extra images from quickbook to the combined documentation.
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  r48929 | danieljames | 2008-09-23 20:44:20 +0100 (Tue, 23 Sep 2008) | 1 line
  
  Change quickbook so that the links are relative to the combined documentation.
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  r48930 | danieljames | 2008-09-23 20:44:39 +0100 (Tue, 23 Sep 2008) | 1 line
  
  Remove the prebuilt version of quickbook.
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[SVN r48957]

doc/Jamfile.v2

@@ -69,11 +69,14 @@ boostbook doc
 
     <dependency>css
     <dependency>images
+    <dependency>callouts
     ;
 
 install css : [ glob src/*.css ] : <location>html ;
 explicit css ;
 install images : [ glob src/images/*.png ] : <location>html/images ;
 explicit images ;
+install callouts : [ glob src/images/callouts/*.png ] : <location>html/images/callouts ;
+explicit callouts ;
 
 

tools/boostbook

@@ -1 +1 @@
-Subproject commit 216e499a5169717a1925af715ad64b792acea12f
+Subproject commit 50c6d2277e7be0cae5e165557b529ada30b3ae83

tools/quickbook

@@ -1 +1 @@
-Subproject commit ec0c61a8f0fe5ac299325ff10ae22f0a73dbd27f
+Subproject commit 28dd9943324e96f1a6029bef7f7d83c29458229a