The layout applies to all boards sharing the nrf52840 chip.

No, we don't want to run: Command '['rustup', '-', '-', 'v', 'e', 'r', 'b', 'o', 's', 'e', 'install', 'nightly-2020-02-03']'

Now that it has been released and pushed to pypi, make sure that
tockloader is at least 1.4 version

Now the script supports more flashing methods:
- JLink (with tockloader)
- OpenOCD (with tockloader)
- pyOCD
- Nordic DFU
- none (will produce an IntelHex file)

Also merged the contributions from:
- Yihui Xiong to support the Makerdiary USB dongle board
- Dennis Geurts to support Nordic DFU

Doc updated accordingly.

Imported 2 patches for Tock kernel:
- 06-add-set_vector_table_offset.patch (upstream tock/tock#1579)
- 07-nrf52-bootloader.patch (upstream tock/tock#1681)

This permits to run without persistent storage. The benefit is that the board
doesn't implement a the syscall API in Tock. The disadvantage is that rebooting
the key will reset the storage.

It seems that our internal linter is stricter than what pylint does.
Fixing the python code to make both happy and tries to fix the gap by
modifying pylintrc configuration file