Rigel 1.7.2

• Add RTH+ALPH and RTH+ALPH+ZIL mining support (see dual-rth-alph bat/sh script)
• Improve RTH+RXD performance (30xx and 40xx GPUs)
• Improve ERG+RXD, ERG+ALPH, ERG+KAS performance

Known issues: ERG dual modes see hashrate improvements only when the dual ratio is locked in with --dual-mode a12:rXX. Auto-tune incorrectly picks low ratios resulting in poor performance.