raspberrypi-ua-netinst v2.0.0

Changelog:

• support for Debian 9 (stretch)
• support boot or/and install from USB mass storage
• added or changed configuration variables:
  • release is set to "stretch" by default
  • ability to disable IPv6
• retry debootstrap 3 times
• increased network configuration timeout to 15 seconds
• increased package download retries to 5

Bugfixes:

• visual LED notification on Raspberry Pi Zero (W)
• fix log output chopping
• leave screen always on during installation

Credits:

Thanks again for all your contribution, testing and feedback.