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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cd2nroff/manage: use UTC when SOURCE_DATE_EPOCH is set

Make them independent of the TZ setting. Also set a date string like
YYYY-MM-DD to avoid a local month name in the date.

R

cd2nroff/manage: use UTC when SOURCE_DATE_EPOCH is set

Make them independent of the TZ setting. Also set a date string like
YYYY-MM-DD to avoid a local month name in the date.

Reported-by: Carlos Henrique Lima Melara
Fixes #13242
Closes #13243

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managen: remove space before protocols

For options that are listed for specific protocols, the protocols (shown
first within parentheses) are now output without the leading space in the

managen: remove space before protocols

For options that are listed for specific protocols, the protocols (shown
first within parentheses) are now output without the leading space in the
manpage output.

Closes #13105

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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