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 r274124: Temporarily _disable_ compilation of dpv(1,3)

NB: MFC broken into two halves (first half to bring in the new dirs so
mergeinfo can be properly recorded on them -- the second half of MFC).

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