[bhbuff]Some minor improvements:   - Parameterize wait_for_threshold. Avoid problems of shared state.   - Avoid loss-of precision in calculating PIECETOLOAD by multiplying first   - Increase dd read-blocks to 4096 for less cpu-load.   - Don't accidentally kill the wrong bhgets and dd:s
[bhbuff]Some minor improvements:
  - Parameterize wait_for_threshold. Avoid problems of shared state.
  - Avoid loss-of precision in calculating PIECETOLOAD by multiplying first
  - Increase dd read-blocks to 4096 for less cpu-load.
  - Don't accidentally kill the wrong bhgets and dd:s

rawler/bithorde,rawler/bithorde,rawler/bithorde