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/02-encryption.patch

@@ -12,18 +12,19 @@ This patch header follows DEP-3: http://dep.debian.net/deps/dep3/
  1 file changed, 2 insertions(+), 1 deletion(-)
 
 diff --git a/scsi-layer.c b/scsi-layer.c
-index 99b2ce9..13784dd 100644
+index d68533b..6717b12 100644
 --- a/scsi-layer.c
 +++ b/scsi-layer.c
-@@ -2693,11 +2693,12 @@ DeviceHandle* OpenAndQueryDevice(char *device)
+@@ -2711,12 +2711,13 @@ Image* OpenImageFromDevice(char *device)
         	 return NULL;
        }
     }
 -
 +/*
     if(dh->mainType == DVD && query_copyright(dh))
-    {  CloseDevice(dh);
+    {  CloseImage(image);
        Stop(_("This software does not support encrypted media.\n"));
+       return NULL;
     }
 +*/