only declare options that are different from default templates values in ".sb" files

naheulbeuk.sb

@@ -7,27 +7,21 @@
   ],
 "booktype" : "chorded",
 "footer" : "Musique du Naheulband: \\url{http://www.penofchaos.com/warham/donjon-groupe.htm}",
-"indexbgcolor" : "#D1E4AE",
 "license" : "\\input{license-nb.tex}",
-"mail" : "crep@team-on-fire.com",
-"mainfontsize" : "10pt",
-"notebgcolor" : "#FFFDB3",
 "picture" : "ranger",
 "picturecopyright" : "Personnages par \\emph{Pen Of Chaos} / Illustrations par \\emph{Marion Poinsot}",
-"songnumberbgcolor" : "#D1E4AE",
 "subtitle" : "Recueil de chansons non-officiel",
 "title" : "Le Donjon de Naheulbeuk",
 "version" : "0.4",
-"web" : "http://www.patacrep.com",
 "songs" : [
     "Belyscendre/Mon_pere_veut_me_marier.sg",
     "Belyscendre/Prends_garde_au_loup.sg",
     "Le_Donjon_de_Naheulbeuk/10_sous_dans_ma_poche.sg",
     "Le_Donjon_de_Naheulbeuk/Bugger_off.sg",
-    "Le_Donjon_de_Naheulbeuk/Geste_heroique.sg",
     "Le_Donjon_de_Naheulbeuk/La_biere_du_donjon.sg",
     "Le_Donjon_de_Naheulbeuk/La_compagnie_du_chien_rugissant.sg",
     "Le_Donjon_de_Naheulbeuk/La_complainte_de_la_serveuse.sg",
+    "Le_Donjon_de_Naheulbeuk/Geste_heroique.sg",
     "Le_Donjon_de_Naheulbeuk/La_polka_du_menestrel.sg",
     "Le_Donjon_de_Naheulbeuk/La_vie_d_aventurier.sg",
     "Le_Donjon_de_Naheulbeuk/Les_chaussettes_du_nain.sg",

songbook.sb

@@ -1,13 +1,4 @@
 {
 "template" : "patacrep.tmpl",
-"title" : "Recueil de chansons pour guitare",
-"author" : "Romain Goffe \\and Alexandre Dupas",
-"version" : "3.2",
-"web" : "http://www.patacrep.com",
-"mail" : "crep@team-on-fire.com",
-"picture" : "feel-the-music",
-"picturecopyright" : "foxygamergirl @ deviantart.com",
-"footer" : "\\begin{flushleft}\\includegraphics[width=3cm]{on-fire}\\end{flushleft}",
-"license" : "\\input{license.tex}",
 "songs" : "all"
 }

utils/header-english

@@ -1,21 +1,10 @@
 {
 "template" : "patacrep-en.tmpl",
-"author" : "Romain Goffe \\and Alexandre Dupas",
 "bookoptions" : [
     "diagram",
     "lilypond"
   ],
 "booktype" : "chorded",
-"footer" : "\\begin{flushleft}\\includegraphics[width=3cm]{on-fire}\\end{flushleft}",
-"indexbgcolor" : "#D1E4AE",
-"license" : "\\input{license-en.tex}",
-"mail" : "crep@team-on-fire.com",
-"mainfontsize" : "10pt",
-"notebgcolor" : "#D1E4AE",
-"picture" : "Music_by_Katie8594",
-"picturecopyright" : "Katie8594 @ deviantart.com",
-"songnumberbgcolor" : "#D1E4AE",
 "subtitle" : "english songs",
 "title" : "Guitar Songbook",
-"web" : "http://www.patacrep.com",
 "songs" : [

utils/header-french

@@ -1,3 +1,4 @@
 {
 "template" : "patacrep.tmpl",
+"subtitle" : "chanson française",
 "songs" : [

volume-1.sb

@@ -1,23 +1,12 @@
 {
 "template" : "patacrep.tmpl",
-"author" : "Romain Goffe \\and Alexandre Dupas",
 "bookoptions" : [
     "diagram",
     "lilypond"
   ],
 "booktype" : "chorded",
-"footer" : "\\begin{flushleft}\\includegraphics[width=3cm]{on-fire}\\end{flushleft}",
-"indexbgcolor" : "#D1E4AE",
-"license" : "\\input{license.tex}",
-"mail" : "crep@team-on-fire.com",
-"mainfontsize" : "10pt",
-"notebgcolor" : "#D1E4AE",
-"picture" : "feel-the-music",
-"picturecopyright" : "foxygamergirl @ deviantart.com",
-"songnumberbgcolor" : "#D1E4AE",
 "subtitle" : "Tome 1",
 "title" : "Recueil de chansons pour guitare",
-"web" : "http://www.patacrep.com",
 "songs" : [
     "Alain_Bashung/Gaby_oh_gaby.sg",
     "Amy_MacDonald/Mr._Rock_n_Roll.sg",

volume-2.sb

@@ -1,23 +1,13 @@
 {
 "template" : "patacrep.tmpl",
-"author" : "Romain Goffe \\and Alexandre Dupas",
 "bookoptions" : [
     "diagram",
     "lilypond"
   ],
 "booktype" : "chorded",
-"footer" : "\\begin{flushleft}\\includegraphics[width=3cm]{on-fire}\\end{flushleft}",
-"indexbgcolor" : "#D1E4AE",
-"license" : "\\input{license.tex}",
-"mail" : "crep@team-on-fire.com",
-"mainfontsize" : "10pt",
-"notebgcolor" : "#D1E4AE",
 "picture" : "sound",
 "picturecopyright" : "ellesh @ deviantart.com",
-"songnumberbgcolor" : "#D1E4AE",
 "subtitle" : "Tome 2",
-"title" : "Recueil de chansons pour guitare",
-"web" : "http://www.patacrep.com",
 "songs" : [
     "Aaron/U_turn_lili.sg",
     "Alain_Souchon/Foule_sentimentale.sg",