Rigel 1.9.0

* (CFX) Add `octopus` algorithm (2% dev fee, see `cfx` bat/sh script), including
  * CFX+RXD and CFX+RXD+ZIL (see `dual-cfx-rxd` bat/sh script)
  * CFX+ALPH and CFX+ALPH+ZIL (see `dual-cfx-alph` bat/sh script)
* Add OCTA+RXD and OCTA+RXD+ZIL mining support