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Ensures the compiler performs tail recursion elimination.

They became obsolete as of commits:

* b8f92c95
* 548e90b1

It adds consistency. For instance, we were having
receive_from_with_fds() and no matching receive_from(). Also the
receive() function from datagram sockets didn't match the interface
for receive() in other objects.

Now the functions receive_with_fds()/send_with_fds() can be used to pass
fds over AF_UNIX sockets.

The API is very tricky to get right. Some quirks are documented at
<https://gist.github.com/kentonv/bc7592af98c68ba2738f4436920868dc>.

Example on how to iterate over all fds to close() unexpected fds can be
found on code that need to defend against such attacks (e.g. systemd).

Right now it's just an internal type, but it'll be useful for
sending/receiving fds through IPC.

* spawn_ctx_threads() is now spawn_context_threads
* inherit_ctx is now inherit_context

Navigation should be better now.

Navigation should be better now.

Right now it's always 1, but it's important to have this now so user
code won't break when we change behavior later.

leveloffset must be decremented by the end.

Original text came from the fortune-mod package.

The algorithm is already required by stream.scanner anyway.

Operating on a character-by-character basis upon byte_span from Lua
would be too much overhead. Therefore some useful and practical high
level algorithms are important.