Feature list of current code

• Calculation of singlet states in Tamm-Dancoff approximation
• `Pure' and hybrid-DFT adiabatic XC kernel
• Solvers: Conjugate gradient and block Davidson (both with preconditioning)
• G-vector parallel
• Optimisations for $\Gamma$-point
• Calculation checkpointing and restart
• Oscillator strengths (for computing spectra)
• Characterisation of eigenvectors by decomposing into KS orbitals