Merge branch 'embed.fnc' into blead

This series of commits slightly improves XS code name space pollution
from the core, and better documents what is happening.

It adds a new C flag to embed.fnc which doesn't change the pollution
problem, but makes it easier for downstream tools, like Devel::PPPort.

Some of the inline.h functions didn't even have prefixes, contrary to
our policy of having functions visible outside the core have a 'Perl_'
prefix.

The branch also documents a couple of API functions and macros.

And better error checking of embed.fnc entries is now done.

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