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ANSI C doesn't require that strncpy() produced null-terminated string, so
it's basicly useless for string manipulation.

Link to vendor forum with datasheets, etc. is provided, as well as inline
TTX.

Previously, "import _io" worked on both CPython and MicroPython (essentially
by a chance on CPython, as there's not guarantee that its contents will stay
the same across versions), but as the module was renamed to uio, need to use
more robust import sequence for compatibility.

This machine.I2C documentation is now closer to a more port-neutral
description, although there are still differences between WiPy and
ESP8266.

A standard I2C address is 7 bits but addresses 0b0000xxx and 0b1111xxx
are reserved.  The scan() method is changed to reflect this, along with
the docs.

Fixes build under MacOSX.

Per current CPython docs conventions, arguments are in italics. Follow
that.

If there's no port_config.py file, or it lacks WEBREPL_PASS variable,
"initial setup mode" will be entered on first WebREPLconnection. User
will be asked for password, which will be written to
port_config.WEBREPL_PASS, and system restarted to work in normal mode
with password active.

Handling of binary protocol is untested on esp8266 so far.

After password is checked.

Request for password then becomes mandatory part of the protocol.

Currently it pre-imports webrepl, but doesn't start it.