Utils: add rules to latex-preprocessing

songs/Alicia_Keys/If_aint_got_you.sg

@@ -21,11 +21,11 @@
   \endverse
 
   \beginchorus
-    \[Sol7]Some \[Lam]peo\[Sim]ple \[Cmaj7]want it all, but 
+    \[Sol7]Some \[Lam]peo\[Sim]ple \[Do7]want it all, but 
     I don't \[Sim]want nothing at all. 
     If it ain't  \[Lam]you baby;  
     If I ain't got \[Sol7]you baby  
-    \[Sol7]Some \[Lam]people \[Sim]want \[Cmaj7]diamond rings 
+    \[Sol7]Some \[Lam]people \[Sim]want \[Do7]diamond rings 
     Some just want \[Sim]everything, but everything means
     \[Lam]nothing, If I ain't got \[Sol7]you, yeah
   \endchorus

songs/Le_Donjon_de_Naheulbeuk/Noel_en_Mordor.sg

@@ -14,14 +14,14 @@
     Du Mor\[Lam]{dor à} la Com\[Do]té 
     C'est \[Sol]Noël, c'est \[Mim]Noël
     Du Mor\[Lam]{dor à} la Com\[Do]té
-    Tous les \[Sol]voeux sont \[Mim]exau\[Lam]cés
+    Tous les \[Sol]vœux sont \[Mim]exau\[Lam]cés
   \endchorus
   
   \beginverse
     \[Lam]Imagi\[Sol]nez que \[Fa]Père Noël le \[Mim]vieux
     \[Lam]Souhaitant sou\[Sol]dain com\[Fa]pléter sa tour\[Mim]née
     \[Lam]{S'en} fut per\[Sol]du dans \[Fa]les Terres du Mi\[Mim]lieu
-    \[Lam]Les voeux de \[Sol]tous vou\[Fa]drait réali\[Mim]ser
+    \[Lam]Les vœux de \[Sol]tous vou\[Fa]drait réali\[Mim]ser
   \endverse
 
   \beginverse

utils/latex-preprocessing.py

@@ -1,23 +1,36 @@
 #!/usr/bin/python
 # -*- coding: utf-8 -*-
 
+# warning: lines beginning with ## are parsed by 
+# the songbook-client as rules categories 
+
+
 import glob
 
 # the dictionary has target_word:replacement_word pairs
 word_dic = {
-#oe inclusion
+##: oe inclusion
 "coeur": "cœur",
 "boeuf": "bœuf",
 "oeuvre": "œuvre",
 "soeur": "sœur",
 "noeud": "nœud",
 "oeil": "œil",
+"voeu": "vœu",
 "oe{}": "œ",
-#punctuation
+##: Punctuation
 "’": "'",
 "Ca ": "Ça ",
 "...": "\\dots ",
-#Chords
+##: Conversion from anglo-saxon conventions
+"\\[A": "\\[La",
+"\\[B": "\\[Si",
+"\\[C": "\\[Do",
+"\\[D]": "\\[Ré]",
+"\\[E": "\\[Mi",
+"\\[F]": "\\[Fa]",
+"\\[G": "\\[Sol",
+##: Guitar tabs
 "\\[Re]": "\\[Ré]",
 "b]": "&]",
 #Do