I hacked readTextWithDescrFrame() and readTFrame() to generalize them
to other case (presence or not of a language and whether or not the
data part is encoded (URL are not)
This patch depend of 3b7a3d5485 since I found the
bug while developping this patch
Sometimes, we can have this configuration :
description 00 00 00 data (with delim = [00 00])
with splitN, we make the separation at the first 00 00 :
[description, 00 data]
But in fact, we must make the separation one byte later
[description 00, data]
