talk about libssh2 modifications and sftp-firewall for sftp-server...

Also document how to enable debugging for libssh2 for tracking things
down...

server doesn't support it, EOPNOTSUPP is returned..

This gets things working sanely for packaging...

Also did some line wrapping..

Merge commit '1507d27be0bbb550ca53ca8215a997a1b31e9017' into ssh-main

f75f3488 add some debugging for understanding how these flags are set..
57635ddf disable read ahead algorithm so we don't waste bandwidth..

git-subtree-dir: libssh2
git-subtree-split: f75f3488824d7935d15d75a869783b37fe446927

git-subtree-dir: libssh2
git-subtree-split: 6c7769dcc4

a patched version that does not do read ahead.  It also supports
resizing when rescuing and the file has changed sizes..

the performance is ok, but likely can be improved upon:
libcurl seems to not reuse connections, why not?
libcurl when using any auth, ALWAYS tries unauth'd for EVERY
  request instead of caching that this url NEEDs auth
there are some error handling cases that could be improved

displayed..

This isn't the best as it depends upon a WebDAV server already running..

It uses additional threads to have more IOs inflight.  This
should be useful for devices, but likely not for files.

for communication instead of TCP.  This allows you to forward the
connection over ssh in a secure maner.  Though you can forward TCP
sessions over ssh, it doesn't implement authentication, so ANYONE
on the box could end up accessing the disks.  With socks you can use
file system permissions to restrict them.

still let users set this if needed...

admbugs:	590
Submitted by:	Fabian Keil <fk@fabiankeil.de>
Obtained from:	ElectroBSD

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.