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SET 2ndRotation rotation

Real :: rotation               ! rotation angle [deg]

Set rotation angle for the secondary mirror and Wobbler mechanism [deg].

The angle is limited to be between -50 and +50 [deg].

NOTE: Its sense is opposite to the mathematical convention!
(this will be changed in a future release of the NCS.)

The rotation angle is relative to the horizontal system.  A value of 0.0
corresponds to the Wobbler switching purely in Azimuth, i.e., "normal"
Wobbler switching.  

Observers must inform the operator if they want to use this feature.

A non-zero values is up to know only meaningful and supported for
bolometer observations with Wobbler switching and the observing modes:
POINTING, FOCUS, and OTFMAP.  The OTF map must be set to be in the
(true-angle) horizontal system and the direction of the OTF subscans
must agree with that of the 2ndRotation.  (There is a special pako
script available in the bolometer pool to do this).

To avoid un-intentional errors, this feature can only be used by "privileged
users": ask the AOD or the NCS team.

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