GitLab

addition of references for paro_gamma
update to run_all_examples script

change to pcg.f90 in ParO to force the residual and search vectors to be orthogonal to the occupied manyfold.
Not totally sure of the S|psi0Xpsi0| or |psi0Xpsi0|S order

- solve the linear system in the subspace orthogonal to current occupied manyfold
- as eigenvalues start converging use the available space to add extra correction vectors
- preconditioning performed by calling g_1psi

not strictly needed.

Some unit-test stuff also added to UtilXlib
install/makedeps script updated

Performance still to be verified and tuned

updating cb_* codes. remove generic reference directory (each code has its one)

updated cb_ppcg mains with print_clocks calls.
updated reference outputs for PPCG

only ionode writes the output