Added optional info argument to choose_eigv_solver() for external error handling.


git-svn-id: svn://svn.code.sf.net/p/cp2k/code/trunk@12788 bac0169d-1eea-4375-b5f6-f89d2ced9994
BFGS: Reset Hessian to unity when matrix diagonalization failes (very rare case).


git-svn-id: svn://svn.code.sf.net/p/cp2k/code/trunk@12789 bac0169d-1eea-4375-b5f6-f89d2ced9994