tilt module: limit angles between 0 and 90 degrees
Add FFTW to Makefile
Simplify TILT module; some more cleasning in TWIST; update documentation and tests.
Optimize how pdb are written in TILT and TWIST VISUAL; add example in tests/tilt_twist/ folder.
Add VISUAL to TILT and TWIST
Add curvature module
Remove old gpu arch from CMake
Fix writing pdb for atoms with coordinates less...