GitLab

SPI bus speed divider to 4, suggested by Greg Copeland.  Also removed duplicated spi setup out of begin(), as it's all in csn()

US/Internationally legal while ensuring no spectrum bleed.

Test refinement.  IRQ test times out after not receiving anything, warning that you probably don't have interrupts hooked up.

Fix bugs.  Ack payload available was broken since interrupts went in.  stREtries was missing since the gcopeland merge.

completely took out all of the constant correctness enahcements. Also
added a powerUp() method.

order to minimize noisy/false message reception. Removed begin call
from constructor as begin now has delay which creates timer race
initialization. The delay exists to allow for power on/reset radio
settling which can otherwise prevent CONFIG bits from holding. Added a
method to allow CRC hardware validation to be disabled. This is a
requirement for various promiscuous listening RF applications. Setting
CRC width now forces CRC hardware validation enable.

for specific pipelines per suggestion.