Refresh and drop patches.

The following patches have been dropped:
    01-libpng15.patch
    06-remove-encoding-from-desktop-file.patch
    07-fix-spelling-errors-in-binaries.patch
    09-fix-format-security-warnings.patch
    21-fix-privacy-breach-in-doco.patch

debian/patches/23-add-bdrom-support.patch

@@ -18,10 +18,10 @@ This patch header follows DEP-3: http://dep.debian.net/deps/dep3/
  1 file changed, 1 insertion(+), 1 deletion(-)
 
 diff --git a/scsi-layer.c b/scsi-layer.c
-index 0ba0976..8b005ec 100644
+index 3be21ff..b70a4a4 100644
 --- a/scsi-layer.c
 +++ b/scsi-layer.c
-@@ -1035,7 +1035,7 @@ static int query_bd(DeviceHandle *dh, int probe_only)
+@@ -1029,7 +1029,7 @@ static int query_bd(DeviceHandle *dh, int probe_only)
  
     if(!strncmp((char*)&buf[4+8], "BDO", 3))
     {  dh->typeDescr = g_strdup("BD-ROM");