- Removing sigma and eps from IPData, now stored in current state and prev state.
 - Remove associated ip getter and setter, now handled through reflections
 - Stress, stiffness tensor, and volumetric body force are now fetched from
   newly updated constitutive data (CD).

Mostly in the file headers.

find *Lib -type f | xargs sed -i 'N;s%^\s\+\*\n\(\s\+\*/\)%\1%'

Clang format run on near-the-header lines.

Happy New Year