Add Range.sample for TheDamian++
remove accidental duplication
doc that [Xop] now does not flatten
[S15] Add $*UNICODE and Unicode version pragma.

This allows the user to gain some stability in the cases where Unicode's
stability policy isn't sufficient.
bring <cntrl> in line with <:Cc>
recommend <:alpha> for no underscore
Change E<NEL> to E<0x85>

Currently errors on rakudo. NEL is in reality an alias for a codepoint
without a current Unicode name, U+0085. Since it's unclear if such
aliases are supposed to work, for now play it safe.
[S26] This won't work without explicit code block
Merge branch 'master' into pod6ify
[S32::Containers] Fix POD thing.

Funny how it's the only needs-fix change from the merge.