Invalid (X)HTMLsequence

In packages.html we get:
`Element style is not declared in p list of possible children`
as the `style` tag is only allowed in the `head` part of a file.

The specific changes are only needed for this one file, so it has been implemented using the post processing facility of te CGAL documentation generation.

Documentation/doc/Documentation/packages.txt

@@ -2,15 +2,6 @@
 
 \page packages Package Overview
 
-\htmlonly
-<style type="text/css">
-h1 {
-	font-size: 150%;
-    background-color: #EEEDF2;
-}
-</style>
-\endhtmlonly
-
 \section PartAlgebraicFoundations Arithmetic and Algebra
 
 \package_listing{Algebraic_foundations}

Documentation/doc/scripts/html_output_post_processing.py

@@ -328,6 +328,11 @@ removes some unneeded files, and performs minor repair on some glitches.''')
 
     re_replace_in_file('\[external\]', '', os.path.join('Manual','annotated.html'))
 
+    # replace h1 tag with some special style properties
+
+    re_replace_in_file("<h1>", "<h1 style=\"font-size: 150%; background-color: #EEEDF2;\">",
+                       os.path.join('Manual','packages.html') )
+
     # fix class/concept mismatch in generated pages
     relationship_pages=list(package_glob('./*/hasModels.html'))
     relationship_pages.extend(package_glob('./*/generalizes.html'))