MFC r274116:

Add new libraries/utilities for data throughput visualization.
dpv(3): dialog progress view library
dpv(1): stream data from stdin or multiple paths with dialog progress view
figpar(3): configuration file parsing library

MFC r274120, r274121, r274123, r274124, r274144, r274146, r274159, r274192,
r274203, r274209, r274226, r274270, and r274851: Fixes following r274116

Reviews:        D714
Relnotes:       New libdpv/libfigpar and dpv(1) utility
Reviewed by:    jelischer, shurd
Discussed at:   MeetBSD California 2014 Vendor/Dev Summit
Discussed on:   -current
Thanks to:      ngie, ian, jelischer, shurd, bapt