docs/cmdline-opts: invoke managen using a relative path

... no need to use an absolute path, that makes the build unncessarily
fail if invoked using a different mount point. managen now

docs/cmdline-opts: invoke managen using a relative path

... no need to use an absolute path, that makes the build unncessarily
fail if invoked using a different mount point. managen now takes options
to find the input files.

Update test1478 to provide the dir arguments to managen

Closes #13281

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scripts/managen: the new name and home for the manpage generator

It was previously docs/cmdline-opts/gen.pl

Closes #13089

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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test1478: verify src/tool_listhelp.c

Verify that the source file on disk is identical to the output of gen.pl
listhelp, as otherwise they are out of sync and need attention.

Clo

test1478: verify src/tool_listhelp.c

Verify that the source file on disk is identical to the output of gen.pl
listhelp, as otherwise they are out of sync and need attention.

Closes #12612

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