Log Message:
pv: Update to 1.6.6

Changes:

(r161) use %llu instead of %Lu for better compatibility (Eric A. Borisch)
(r162) (#1532) fix target buffer size (-B) being ignored (AndCycle, Ilya Basin, \ 
Antoine Beaupré)
(r164) cap read/write sizes, and check elapsed time during read/write cycles, to \ 
avoid display hangs with large buffers or slow media; also remove select() call \ 
from repeated_write function as it slows the transfer down and the wrapping \ 
alarm() means it is unnecessary
(r169) (#1477) use alternate form for transfer counter, such that 13GB is shown \ 
as 13.0GB so it's the same width as 13.1GB (André Stapf)
(r171) cleanup: units corrections in man page, of the form kb -> KiB
(r175) report error in "-d" if process fd directory is unreadable, or \ 
if process disappears before we start the main loop (Jacek Wielemborek)