OpenMP, can't remember if i tested bands_wt_all

[sthartman]

Here's the OpenMP parallelization. I also deleted a few variables which were declared but not used. I don't remember the exact reason for changing the error code in the READ statements, but for some reason I had to do that to make it work - I think it's because it called a subroutine with a static variable. In general I recall that I had trouble with READ operations, I believe it uses some kind of buffer that's shared between the threads so it's not very thread-safe.

I would suggest testing the bands_wt_all if you have the input files on hand to do it, I don't remember if I tested that one myself. It might need an OMP_CRITICAL like the other one.