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From https://github.com/pfalcon/zephyr_getchar .

Also, drop deprecated (as for MicroPython) readall() method.

To save iRAM.

Reduces esp8266 code size by about 230 bytes.

This is an often used code pattern, and its use reduces code size of the
core by about 100 bytes.

Added options to make deploy so it can be used for ESP8266 boards with
other flash configurations.  For example NodeMCU DEVKIT V1.0 can now use:

    $ make FLASH_MODE=dio FLASH_SIZE=32m deploy

The deleted code is unreachable because calcsize_items guarantees that
num_items corresponds to how many items there are in fmt to unpack.

SHA1 can only be supported if ussl module is compiled in, and it uses
axtls.

The output might contain more than one line ending in 5b so properly skip
everything until the next known point.
This fixes test failures in appveyor debug builds.

Implementation of machine.RTC.alarm_left(), like described in the
documentation.

Fully self-hosted release (without fallbacks), and uses stream gzip
decompression (step towards support for limited-heap baremetal systems).

upip will use first non-empty component in sys.path as an install path
(if MICROPYPATH envvar is not set, like it will be for baremetal targets).

Useful to better understand esp8266 inner workings and compare behavior
in different cases.