To make the man page more readable, this change removes all references
to changes in support/versions etc that happened before 7.30.0 from the
curl.1 output file. 7.30.0 was released on Apr 12 2013. This particular
limit is a bit arbitrary but was fairly easy to grep for.
It is handled like this: the 'Added' keyword is only used in output if
it refers to 7.30.0 or later. All occurances of "(Added in $VERSION)" in
description will be stripped out if the mentioned $VERSION is from
before 7.30.0. It is therefore important that the "Added in..."
references are always written exactly like that - and on a single line,
not split over two.
This change removes about 80 version number references from curl.1, down
to 138 from 218.
Closes#7786
Warning: this will make existing curl command lines that use metalink to
stop working.
Reasons for removal:
1. We've found several security problems and issues involving the
metalink support in curl. The issues are not detailed here. When
working on those, it become apparent to the team that several of the
problems are due to the system design, metalink library API and what
the metalink RFC says. They are very hard to fix on the curl side
only.
2. The metalink usage with curl was only very briefly documented and was
not following the "normal" curl usage pattern in several ways, making
it surprising and non-intuitive which could lead to further security
issues.
3. The metalink library was last updated 6 years ago and wasn't so
active the years before that either. An unmaintained library means
there's a security problem waiting to happen. This is probably reason
enough.
4. Metalink requires an XML parsing library, which is complex code (even
the smaller alternatives) and to this day often gets security
updates.
5. Metalink is not a widely used curl feature. In the 2020 curl user
survey, only 1.4% of the responders said that they'd are using it. In
2021 that number was 1.2%. Searching the web also show very few
traces of it being used, even with other tools.
6. The torrent format and associated technology clearly won for
downloading large files from multiple sources in parallel.
Cloes #7176
