Remove $FreeBSD$: two-line nroff pattern

Remove /^\.\\"\n\.\\"\s*\$FreeBSD\$$\n/

Indicate the port where the referenced man pages come from.

Bump copyright following recent changes

Use full month in dpv(3), figpar(3), and bsdconfig(8) manuals

Reported by: maxim

Fix typo and lint/igor warnings

Add keep_tite configuration option

Similar to dialog(3) keep_tite option used to prevent visually disturbing
initialization or exit that could occur when run from a script using
dpv(3) by way of dpv(1) in sequence with other dialog(1) invocations.

Bump date/copyright after correcting HISTORY

MFC after: 3 days
X-MFC-to: stable/10
X-MFC-with: r289790

dpv(3) merged to stable/10 before release/10.2.0

MFC after: 3 days
X-MFC-to: stable/10

mdoc: improvements to SEE ALSO.

Misc mdoc fixes:

- Remove superfluous paragraph macros.
- Remove/fix empty or incorrect macros.
- Sort sections into conventional order.
- Terminate quoted strings properly.
- Remove EOL whitespace.

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

Reviews: D714
Reviewed by: jelischer, shurd
Discussed at: MeetBSD California 2014 Vendor/Dev Summit
Discussed on: -current
MFC after: 21 days
X-MFC-to: stable/10 stable/9