- add 'use warnings' and 'use strict' where missing from Perl scripts.
- fix 'Use of uninitialized value'.
- fix missing declarations.
- test1140.pl: fix 'Possible precedence issue with control flow operator'.
- fix other misc issues.
Most actual errors found during this PR were fixed and merged via
separate PRs.
Likely there are remaining warnings not found and fixed in this PR.
Closes#17877
This document now lists all previous releases.
This allows us to verify that documentation refers to actual release
versions.
Test 971 now verifies options-in-versions and all command line options
documentation individually. Fixed a few discrepancies.
Test 1488 verifies libcurl options "Added-in" to exist. Fixed a few
discrepancies there as well.
Closes#16907
