docs/FAQ.txt: add more reasons and symptoms that a running driver dis…

…appears

Merge pull request networkupstools#1345 from jimklimov/doc-netbsd

Doc for netbsd builds, more clang 13 support, more manpage related recipes

“v2.7.4”

Release 2.7.3

NUT 2.7.2 (signed)

NUT v2.7.2

Modify version in configuration descriptor.

Merge branch 'FixWindowsDistrib' into v2.6.5-5

Signed version of NUT v2.7.1 tag

configure: update version to 2.7.1