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[ATM] Anastigmat

Can't get too much more vanilla (150 mm f/7.863):

    http://users.rcn.com/rflrs/Ptz10-34x.atm   ATMOS input file
    http://users.rcn.com/rflrs/Ptz10-34x.len   OSLO input file
    http://users.rcn.com/rflrs/Ptz10-34x.txt   TEXT prescription
    http://users.rcn.com/rflrs/Ptz10-34x.zmx   ZEMAX input file

Even though it is made of really plebeian glass types and
both doublets are cemented, it has FeC color correction and
is anastigmatic -- yes, it only works for this diameter at
f/7.863.  The Visual Strehl is better than 0.7 across the
42 mm diameter field -- no, it's not flat, but has an RoC
larger than the focal length.
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