v2.1.1 - Release

[Wenn0101]

-Fix for failures after 1430 seconds when using older bootloader
-Fix Serial TX not bring able to be re-used as GPIO
-Change SPI so that asking for a higher than max baud rate results in highest baud rate and no error
-Add artemis module target
-Fix RTC rolling alarms example to handle rollover
-Quick fix for clock stretching causing NAK's to show up as ACK's

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This discussion was created from the release v2.1.1 - Release.