Request only one filtered block at a time.
Request only one filtered block at a time.

We can only work on 1 thin block per peer at a time. When requesting
more blocks, request them as full blocks.

stevemyers/bitcoinxt,stevemyers/bitcoinxt,dagurval/bitcoinxt,stevemyers/bitcoinxt,bitcoinxt/bitcoinxt,bitcoinxt/bitcoinxt,dagurval/bitcoinxt,dagurval/bitcoinxt,stevemyers/bitcoinxt,bitcoinxt/bitcoinxt,bitcoinxt/bitcoinxt,bitcoinxt/bitcoinxt,dagurval/bitcoinxt,stevemyers/bitcoinxt,stevemyers/bitcoinxt,bitcoinxt/bitcoinxt,dagurval/bitcoinxt,dagurval/bitcoinxt