iFit/sw_qscan

 creates linear scans between Q points in 3D

 qOut = SW_QSCAN(qLim)

 Example:

 qLim = {[0 1 0] [0 0 0]}
 If the last element of qLim is a scalar, it defines the number of point
 in each linear scan, by defult this value is 100.
 qLim = {[0 1 0] [0 0 0] 50}