getinfo: add CURLINFO_POSTTRANSFER_TIME_T

Returns the time, in microseconds, from the start until the last byte is
sent by libcurl (i.e. the request is sent off).

Closes #14189

managen: "added in" fixes

- up the limit: remove all mentions of 7.60 or earlier from manpage
7.60 is 6 years old now.
- warn on "broken" added in lines, as they avoid detection

managen: "added in" fixes

- up the limit: remove all mentions of 7.60 or earlier from manpage
7.60 is 6 years old now.
- warn on "broken" added in lines, as they avoid detection
- fixup added in markup in a few curldown files

Closes #14002

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test1486: verify that write-out.md and tool_writeout.c are in sync

- also verify alphabetialal order in the source
- add two missing variables to write-out.md

Closes #13920

curl: support -w '%{num_retries}

Suggested-by: Jay Guerette
Ref: https://github.com/curl/curl/discussions/13901
Closes #13910

cmdline-opts: shorter help texts

In an effort to increase the readability of the "--help all" output on
narrow (80 column) terminals.

Co-authored-by: Jay Satiro

Closes

cmdline-opts: shorter help texts

In an effort to increase the readability of the "--help all" output on
narrow (80 column) terminals.

Co-authored-by: Jay Satiro

Closes #13169

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docs: more language cleanups

- present tense
- avoid bad words

Closes #13003

write-out: add '%{proxy_used}'

Returns 1 if the previous transfer used a proxy, otherwise 0. Useful to
for example determine if a `NOPROXY` pattern matched the hostname or
not.

write-out: add '%{proxy_used}'

Returns 1 if the previous transfer used a proxy, otherwise 0. Useful to
for example determine if a `NOPROXY` pattern matched the hostname or
not.

Extended test 970 and 972

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write-out.md: clarify error handling details

- it gets used even if the transfer fails

- it does not cause error to be returned even if it fails

Closes #12909

cmdline-docs: quote and angle bracket cleanup

- make sure angle brackets are escaped
- remove a lot of superfluous double quotes
- replace several double quotes with backticks

cmdline-docs: quote and angle bracket cleanup

- make sure angle brackets are escaped
- remove a lot of superfluous double quotes
- replace several double quotes with backticks

To make nicer-looking markdown.

Closes #12884

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docs/cmdline: change to .md for cmdline docs

- switch all invidual files documenting command line options into .md,
as the documentation is now markdown-looking.

- made the

docs/cmdline: change to .md for cmdline docs

- switch all invidual files documenting command line options into .md,
as the documentation is now markdown-looking.

- made the parser treat 4-space indents as quotes

- switch to building the curl.1 manpage using the "mainpage.idx" file,
which lists the files to include to generate it, instead of using the
previous page-footer/headers. Also, those files are now also .md
ones, using the same format. I gave them underscore prefixes to make
them sort separately:
_NAME.md, _SYNOPSIS.md, _DESCRIPTION.md, _URL.md, _GLOBBING.md,
_VARIABLES.md, _OUTPUT.md, _PROTOCOLS.md, _PROGRESS.md, _VERSION.md,
_OPTIONS.md, _FILES.md, _ENVIRONMENT.md, _PROXYPREFIX.md,
_EXITCODES.md, _BUGS.md, _AUTHORS.md, _WWW.md, _SEEALSO.md

- updated test cases accordingly

Closes #12751

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