git: head(1): Support '-q' and '-v' flags and improve man page

[Aaron LI]

commit f31df7b5941dbdc6e6bb5151595ec5f3fe75b0b9
Author: Aaron LI <aly at aaronly.me>
Date:   Fri Jun 19 13:17:29 2020 +0800

    head(1): Support '-q' and '-v' flags and improve man page
    
    * Support the '-q' flag to never print headers of each filename, and the
      '-v' flag to always print the headers, which are the GNU extensions to
      this tool.
    * Improve the man page to include the 'COMPATIBILITY' and 'STANDARDS'
      sections.
    
    Obtained-from: NetBSD

Summary of changes:
 usr.bin/head/head.1 | 26 +++++++++++++++++++++-----
 usr.bin/head/head.c | 17 ++++++++++++++---
 2 files changed, 35 insertions(+), 8 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/f31df7b5941dbdc6e6bb5151595ec5f3fe75b0b9


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