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/03-dvdrom.patch

@@ -12,10 +12,10 @@ This patch header follows DEP-3: http://dep.debian.net/deps/dep3/
  1 file changed, 5 insertions(+)
 
 diff --git a/scsi-layer.c b/scsi-layer.c
-index 13784dd..cd7795a 100644
+index 6717b12..64a3dba 100644
 --- a/scsi-layer.c
 +++ b/scsi-layer.c
-@@ -913,6 +913,11 @@ static int query_dvd(DeviceHandle *dh, int probe_only)
+@@ -908,6 +908,11 @@ static int query_dvd(DeviceHandle *dh, int probe_only)
  	    break;
  	 }