Waiting for David Clunie's answer, I re added some SQ tag that vanished from

Waiting for David Clunie's answer, I re added some SQ tag that vanished from
the pdf document.
We're *sure* gdcm will break if such a SQ tag is found, within a, 'Implicit VR'
file.
Re added
0041 1050 SQ 1 PAPYRUS 3.0 Serie Sequence
in order to be able again to parse PAPYRUS 3.0
(Next wersion will have a special Papyrus Dictionary, with only *one* tag)