docs: dist curl*.1 and install without perl

Drop docs/mk-ca-bundle.1 from the tarball. It can be generated at will.

Closes #12959
Fixes #12921
Reported-by: Michael Forney

docs: fix the --disable-docs for autotools

Follow-up to 541321507e386

Closes #12870

docs: introduce "curldown" for libcurl man page format

curldown is this new file format for libcurl man pages. It is markdown
inspired with differences:

- Each file has a set of

docs: introduce "curldown" for libcurl man page format

curldown is this new file format for libcurl man pages. It is markdown
inspired with differences:

- Each file has a set of leading headers with meta-data
- Supports a small subset of markdown
- Uses .md file extensions for editors/IDE/GitHub to treat them nicely
- Generates man pages very similar to the previous ones
- Generates man pages that still convert nicely to HTML on the website
- Detects and highlights mentions of curl symbols automatically (when
their man page section is specified)

tools:

- cd2nroff: converts from curldown to nroff man page
- nroff2cd: convert an (old) nroff man page to curldown
- cdall: convert many nroff pages to curldown versions
- cd2cd: verifies and updates a curldown to latest curldown

This setup generates .3 versions of all the curldown versions at build time.

CI:

Since the documentation is now technically markdown in the eyes of many
things, the CI runs many more tests and checks on this documentation,
including proselint, link checkers and tests that make sure we capitalize the
first letter after a period...

Closes #12730

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copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- save

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- saves us from pointless churn
- git keeps history for us
- the year range is kept in COPYING

checksrc is updated to allow non-year using copyright statements

Closes #10205

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copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the

copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the file
`.reuse/dep5`.

This commit also adds a Github workflow to check pull requests and adapts
copyright.pl to the changes.

Closes #8869

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curl.se: new home

Closes #6172

ABI.md: rename to .md and polish the markdown

Closes #5562

docs/libcurl/index.html: removed

The HTML files are long gone from the dist, now remove the last HTML
file pointing to those missing files.

d

cmake: add more missing files to the dist

make: use the variable MAKE for recursive calls

Closes #1366

docs: split file lists into Makefile.inc

For easier sharing with CMake. The contents were reformatted to use
two-space indent and expanded tabs (matching lib/Makefile.common).

R

docs: split file lists into Makefile.inc

For easier sharing with CMake. The contents were reformatted to use
two-space indent and expanded tabs (matching lib/Makefile.common).

Ref: https://github.com/curl/curl/pull/1288

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Makefile.am: Remove distribution man pages when running 'make clean'

docs: de-duplicate file lists in the Makefiles

Make use of macro substitution of suffix patterns to remove duplication
of manual names. This approach is portable according to
http://

docs: de-duplicate file lists in the Makefiles

Make use of macro substitution of suffix patterns to remove duplication
of manual names. This approach is portable according to
http://pubs.opengroup.org/onlinepubs/009695399/utilities/make.html

Closes https://github.com/curl/curl/pull/1287

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dist: remove PDF and HTML converted docs from the releases

dist: include curl_multi_socket_all.3

Closes https://github.com/curl/curl/pull/816

build: use roffit 0.11 feature

... load file specified as argument.

URLs: change all http:// URLs to https://

build: Fix theoretical infinite loops

Add error-checking to 'cd' in a few cases where omitting the checks
might result in an infinite loop.

Closes #535

Revert "has: generate the curl/has.h header"

This reverts commit a60bde79f9adeb135d5c642a07f0d783fbfbbc25 I have
pushed by mistake. Apologies for my incompetent use of the git repo!

has: generate the curl/has.h header

changed macro name, moved and renamed script to become docs/libcurl/has.pl,
generate code that is checksrc compliant

libcurl-thread.3: Consolidate thread safety info

This is a new document to consolidate our thread safety information from
several documents (curl-www:features, libcurl.3, libcurl-tutoria

libcurl-thread.3: Consolidate thread safety info

This is a new document to consolidate our thread safety information from
several documents (curl-www:features, libcurl.3, libcurl-tutorial.3).
Each document's section on multi-threading will now point to this one.

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docs/libcurl: clean up libcurl-symbols.3

docs/libcurl: check that all options with man pages are referenced

If a man page exists in the opts/ directory, it must also be referenced
either in curl_easy_setopt.3 or curl_multi_seto

docs/libcurl: check that all options with man pages are referenced

If a man page exists in the opts/ directory, it must also be referenced
either in curl_easy_setopt.3 or curl_multi_setopt.3

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docs/libcurl: make portability fix

Using $< in a non-suffix rule context is a GNU make idiom. This bug was
introduced in 7.41.0.

libcurl-symbols: first basic shot for autogenerated docs