bectl: push space-in-name check down into libbe

This check was previously in `create` only, not applying to renames. It
should really be applied at the libbe level, so that we can avoid
writing abo

bectl: push space-in-name check down into libbe

This check was previously in `create` only, not applying to renames. It
should really be applied at the libbe level, so that we can avoid
writing about this restriction over and over again.

While we're here: `bectl rename` always succeeds, even when it doesn't.
Start returning the error.

Approved by: re (gjb)
Reported By: Christian McDonald <cmcdonald netgate com>

(cherry picked from commit dadb9c70938c4ae2c260f6af65752c67ac752284)
(cherry picked from commit 227e52a9c0b0be9656757fec47a2648f5619bf67)

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bectl: add some discussion about boot environment layouts

Discuss the standard type of layout, as well as the "deep" BE layout,
and some of the properties of both. Point the various -r flags at thi

bectl: add some discussion about boot environment layouts

Discuss the standard type of layout, as well as the "deep" BE layout,
and some of the properties of both. Point the various -r flags at this
new section, to help users understand which they're working with and
what the -r flag is actually doing. Note that we may just deprecate the
-r flag in future versions, but the flag will be recognized as a NOP at
that point.

Approved by: re (gjb)

(cherry picked from commit c0f846ff235296249271b1235ff6a52b7d23cefb)
(cherry picked from commit 0e90da6549d177874437dc2e7bab085873538da2)

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