stylesheets: fix generation of footnotes

There was two problems:
- the sect1 template did not process the footnote
- footnote processing needed to use a template matching
  footnote/para[1], but we had a template matching para
  at a higher precendence level.
So:
- call process.footnotes at the end of the sect1 template
- Add a templates matching footnote/para[1] at the same import
  level as the template matching para (this just call the original
  template)
We also add a priority 1 to the sect1 template in chunk-code.xsl,
although it is not strictly necessary. This is what upstream
recommends...

stylesheets/lfs-xsl/chunk-master.xsl

@@ -27,8 +27,12 @@
          Prevent creation of dummy sect1 files used to emulate sub-chapters.
          The original template is in {docbook-xsl}/xhtml/chunk-code.xsl
          It also matches other sect* tags. The code for those tags are
-         unchanged. -->
+         unchanged. Note that the priority attribute is not strictly
-  <xsl:template match="sect1">
+         required, because the original template is less restrictive in
+         matching, so has less precedence. But in case the docbook dev
+         add a match="sect1" template in their chunk-code.xsl, then it will
+         be necessary!-->
+  <xsl:template match="sect1" priority="1">
     <xsl:variable name="ischunk">
       <xsl:call-template name="chunk"/>
     </xsl:variable>

stylesheets/lfs-xsl/xhtml/lfs-mixed.xsl

@@ -43,6 +43,16 @@
     </xsl:choose>
   </xsl:template>
 
+  <!-- footnote/para[1]: this template is in {docbook-xsl}/xhtml/footnote.xsl
+       which is imported. This means that template has less precedence
+       than the above one. To have higher precedence, it must be at
+       the same import level (then, since it is more restrictive, it is
+       applied preferably to the above).-->
+  <xsl:template match="footnote/para[1]">
+  <!-- just use the original template -->
+    <xsl:apply-imports/>
+  </xsl:template>
+
     <!-- screen:
            Changed class attribute asignament to fit our look needs.
            Removed unused line numbering support. -->

stylesheets/lfs-xsl/xhtml/lfs-sections.xsl

@@ -166,7 +166,7 @@
       </xsl:choose>
       <xsl:call-template name="language.attribute"/>
       <xsl:apply-templates/>
-      <xsl:apply-templates select="sect1info" mode="svn-keys"/>
+      <xsl:call-template name="process.footnotes"/>
     </div>
   </xsl:template>