[Pw_forum] compilation of bfgs_modules.f90 on Sun

[Antonio Tilocca]

For some reason, the Sun compiler stops while compiling bfgs_modules.f90,
complaining that the .dot. and .times. operators are not defined
in gdiis_step. Adding "USE basic_algebra_routines" at the
beginning of this routine apparently fixes the problem, but I am not sure
why the problem is there in first place.

Antonio Tilocca
Chemistry/UCL/UK