Explicit file permissions enhancement to internal-sftp

[Dr. Nagy Elemér Kár oly]

Dear OpenSSH developers!

Please integrate the "Explicit file permissions enhancement to sftp-server" [1] patch v3 into OpenSSH.

Reasons:
* It increases the usability of OpenSSH as a file server alternative and reduces user friction
* It is already incorporated into RedHat [2][3] and CentOS
* It is on wishlist in Debian [4]
* There are user requests for this function [5][6][7]
* Patch v3 builds cleanly with 7.6p1 (Debian openssh-server 1:7.6p1-2)
* All three authors agreed to put their patch into the public domain

Best wishes, 
Elemér 

[1] https://bugzilla.mindrot.org/show_bug.cgi?id=1844 
[2] https://bugzilla.redhat.com/show_bug.cgi?id=1191055 
[3] https://access.redhat.com/errata/RHBA-2015:1335 
[4] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=841237 
[5] https://superuser.com/questions/937003/setting-default-group-permissions-via-sftp 
[6] https://serverfault.com/questions/70876/how-to-put-desired-umask-with-sftp 
[7] https://superuser.com/questions/1066554/centos-sftp-ssh-how-always-create-files-with-rwx-rwx-r-x-and-always-owned-by-
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