managen: in man output, remove the leading space from examples

Leave that rendering decision to the display tool.

Closes #14735

managen: fix superfluous leading blank line in quoted sections

When a markdown quoted section using 4-space indentation was converted
to nroff, managen previously caused a newline to app

managen: fix superfluous leading blank line in quoted sections

When a markdown quoted section using 4-space indentation was converted
to nroff, managen previously caused a newline to appear after the
leading .nf. This fix makes sure that newline is inserted *before* .nf
as intended.

This is perhaps most notable in the HTML version of rendered manpages if
the quoted sections use different colors or similar.

Closes #14732

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tests/scripts: call it 'manpage' (single word)

Mostly in comments

Closes #14216

cmdline-opts: category cleanup

Option cleanups:

--get is not upload
--form* are post
- added several options into ldap, smtp, imap and pop3
- shortened the category

cmdline-opts: category cleanup

Option cleanups:

--get is not upload
--form* are post
- added several options into ldap, smtp, imap and pop3
- shortened the category descriptions in the list

category curl fixes:

--create-dirs removed from 'curl'
--ftp-create-dirs removed from 'curl'
--netrc moved to 'auth' from 'curl'
--netrc-file moved to 'auth' from 'curl'
--netrc-optional moved to 'auth' from 'curl'
--no-buffer moved to 'output' from 'curl'
--no-clobber removed from 'curl'
--output removed from 'curl'
--output-dir removed from 'curl'
--remove-on-error removed from 'curl'

Add a "global" category:

- Made all "global" options set this category

Add a "deprecated" category:

- Moved the deprecated options to it (maybe they should not be in any
category long term)

Add a 'timeout' category

- Put a number of appropriate options in it

Add an 'ldap' category

- Put the LDAP related option in there

Remove categories "ECH" and "ipfs"

- They should not be categories. Had only one single option each.

Remove category "misc"

- It should not be a category as it is impossible to know when to browse
it.

--use-ascii moved to ftp and output
--xattr moved to output
--service-name moved to auth

Managen fixes:

- errors if an option is given a category name that is not already setup
for in code

- verifies that options set `scope: global` also is put in category
`global´

Closes #14101

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managen: insert final .fi for files ending with a quote

When an individual file ended with a quote (typically an example), the
render function would return without ending the quote corre

managen: insert final .fi for files ending with a quote

When an individual file ended with a quote (typically an example), the
render function would return without ending the quote correctly with a
".fi" (fill in) in the manpage output.

This made the additional text provided below to render wrongly.

Closes #14048

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tests: verify managen

1705: verifies the manpage output

1706: verifies the ascii output

Closes #14025