TWP/SKYRAD/C2 - Reprocess: PIR identified as unshaded is really shaded

On 17Sep01 the Global PIR was moved from the unshaded position
on the Skyrad stand to the new 'shaded' spot on the new K&Z tracker.
It is still using the same Logger channel as it did as an unshaded 
PIR even though it is now shaded.

This problem has been documented in P011109.2.  This DQR should
be linked to that PIF and an end date added when the problem is
resolved.

The unshaded PIR is now a shaded PIR.  Disregard the data description
in the netcdf header

• Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Unshaded
  Pyrgeometer(inst_down_long_unshaded_case_resist)
• Instantaneous Downwelling Pyrgeometer Thermopile, Unshaded Pyrgeometer(inst_down_long_hemisp_unshaded_tp)
• Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Unshaded
  Pyrgeometer(inst_down_long_unshaded_dome_resist)