Fid light dy/dz looks wrong in mica vv report for obsid 22146

[jeanconn]

It looks like dy_mean and dz_mean are wrong for the omitted slot 1 fid light in obsid 22146 because it was spoiled but wasn't that bad :

In [10]: obs = mica.vv.get_arch_vv(22146)
Generating V&V for obsid 22146
Processing aspect interval pcadf679369507N002
Missing slot is FID.
Processing GOOD       star in slot 3
Processing GOOD       star in slot 4
Processing GOOD       star in slot 5
Processing GOOD       star in slot 6
Processing GOOD       star in slot 7
Processing fid HRC-I-1    in slot 0 
Processing fid HRC-I-4    in slot 2 
Processing fid 9 in slot 1 

In [11]: obs.slot_report['1']['dy_mean']
Out[11]: -1235.4312046682039

In [12]: obs.slot_report['1']['dz_mean']
Out[12]: 949.05244418694645
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