1) Ensure web requests request data in-order by fixing the piecepicker
to correctly use 'CanRequestMorePieces'
2) Fix a bug in the handling of padding files. A request for some data
from a webseed needs to take padding files into account in all cases.
A request can begin or end inside padding, it can also begin/end in
regular files while optionally crossing one stretch of padding. This
means the existing logic to insert synethic requests to the padding
file are broken in a number of cases.
1) Ensure web requests request data in-order by fixing the piecepicker to correctly use 'CanRequestMorePieces'
2) Fix a bug in the handling of padding files. A request for some data from a webseed needs to take padding files into account in all cases. A request can begin or end inside padding, it can also begin/end in regular files while optionally crossing one stretch of padding. This means the existing logic to insert synethic requests to the padding file are broken in a number of cases.