BDSQR workspace does not take into account fallback into LASDQ1

After PR #234 and PR #989 workspace of BDSQR has been changed from 4 * N to 4 * (N - 1).

But this new value is not enough to run LASDQ1 in case when no singular values is desired. LASQ1 and, consequently, LASQ2 strongly requires 4 * N memory.

I have already caught segmentation fault in this case. Documentation should be fixed one more time to take into account ( .NOT. ROTATE ) branch.