physiology

Version 1.1

• ETT lumen volume calculation
• Added body surface area variants, thanks to Bill Denney
• Added eGFR calculations, thanks to Bill Denney

Version 1.0

• Everest summit physiology vignette
• Simplified date and age handling
• better test coverage
• some physics and atomspheric pressure calculations
• Added a NEWS.md file to track changes to the package.