echo.1: borrow advice about printf(1) from the OpenBSD man page

Add some commas.

echo.1: add a note about other echo implementations

The other BSDs all have a note reminding that many shells have their
own internal echo implementations which may vary from this utility, so
add on

echo.1: add a note about other echo implementations

The other BSDs all have a note reminding that many shells have their
own internal echo implementations which may vary from this utility, so
add one. (Much of the wording is borrowed from FreeBSD's man page.)

(The other BSDs also have notes about the -n option not really being
portable, and printf[1] being preferable, we might want to add
something about that, too.)

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Use Ex.

Remove workaround for ancient HTML generation code.

While the v2 source and man pages are incomplete, TUHS has a scanned copy of the
printed version of the 2nd edition manual. echo is featured in this copy.
http://www.tuhs.org/Archive/PDP-11/Distribut

While the v2 source and man pages are incomplete, TUHS has a scanned copy of the
printed version of the 2nd edition manual. echo is featured in this copy.
http://www.tuhs.org/Archive/PDP-11/Distributions/research/1972_stuff/unix_2nd_edition_manual.pdf
Ammend HISTORY and bump date.

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Document the version echo first appeared.
Bump date.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22249, verified by myself.

Generate <>& symbolically. I'm avoiding .../dist/... directories for now.

For commands and utilities, use EXIT STATUS rather than RETURN VALUES as
appropriate (and documented in mdoc(7)).

Add 'RETURN VALUE' section header.

Use .Ar macro for argument.

Fix .Nm usage.

convert to new RCS id conventions.

Merge 4.4-Lite version.

Document the fact that echo is POSIX.2 compliant.

Add RCS indentifiers.

changed "Id" to "Header" for rcsids

added rcs ids to all files

initial import of 386bsd-0.1 sources