ide-tape: remove pipeline functionality-v3

Hi Bart,

here's the rest of the pipeline removal series. What's left is to rewrite the whole allocation logic around tape->merge_stage and all the other small buffers so that we can get at least some sanity into the driver before working on it any further :).

 Documentation/ide/ide-tape.txt |  211 ++++---------
 drivers/ide/ide-tape.c         |  689 ++--------------------------------------
 2 files changed, 99 insertions(+), 801 deletions(-)