FIX: refine and emphasise the warning when the response solver does not converge
Currently the response solver simply prints:
*** MICROITERATIONS STOPPED DUE TO LINEAR DEPENDENCE BETWEEN NEW TRIAL VECTORS
*** REQUESTED 1 SOLUTION VECTORS NOT CONVERGED
when the response solver does not converge. This can easily be missed by users and should rather be changed to a more apparent warning, along with the residual norm.
Edited by Simen Sommerfelt Reine