customize song headers and footers.

- introduce two new options:
   - 'url' that links to the artist's website
   - 'original' that refers to the original song
- display the album in the song header

img/src/internet.svg

@@ -0,0 +1,216 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
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+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
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+   id="svg11300"
+   height="22"
+   width="22"
+   version="1.0"
+   inkscape:version="0.48.3.1 r9886"
+   sodipodi:docname="internet.svg"
+   inkscape:export-filename="/home/crep/desktop/applications-internet.png"
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+</svg>

tex/crepbook.cls

@@ -64,6 +64,7 @@
 \definecolor{tango-blue-3}{HTML}{204a87}
 \RequirePackage[bookmarks,
   bookmarksopen,
+  hyperfigures=true,
   colorlinks=true,
   linkcolor=tango-green-3,
   urlcolor=tango-blue-3]{hyperref}
@@ -205,6 +206,8 @@
 \newcommand{\songalbum}{}
 \newsongkey{cov}{\let\songcover\@empty}{\def\songcover{#1}}
 \newsongkey{album}{\let\songalbum\@empty}{\def\songalbum{#1}}
+\newsongkey{url}{\let\songurl\@empty}{\def\songurl{#1}}
+\newsongkey{original}{\let\songoriginal\@empty}{\def\songoriginal{#1}}
 \newcommand\cover{%
   \ifpictures%
     \ifx\songcover\@empty\else%
@@ -216,6 +219,23 @@
   \fi%
 }
 
+% display album in song header
+\renewcommand{\extendprelude}{
+  {\bfseries\showauthors}
+  {\footnotesize\it\songalbum}
+  \IfStrEq{\songurl}{}{}{
+    \href{\songurl}{\includegraphics[width=.3cm]{internet}}
+  }
+}
+\renewcommand{\extendpostlude}{
+  {\footnotesize%
+    \IfStrEq{\songoriginal}{}{}{
+      \IfStrEq{\@lang}{english}{Original song:}{Chanson originale :}
+      \songoriginal
+    }
+  }
+}
+
 \newlength{\capoheight}
 \setlength{\capoheight}{1.5cm}
 \renewcommand\capo[1]{%