We have added a column ROLL_ANGLE_STRAT to the FD_PATTERN table, to allow
specification of the roll angle strategy. The existing patterns all have
strategy: Static, indicating that all points will be scheduled with the same
roll angle -- no manipulation from the pattern will be done. In a future
release we will be able to specify Sequential here, indication that with
each cycle through the pattern, we make a step through the allowed range of
roll angles (Screw 597).