Tweak toast_so_convert book output to match data better

In the output from toast_so_convert, please adjust:

In M_index.yaml:

• Value for telescope should be lower case, e.g. "lat" not "LAT", "satp1" not "SATP1" (and definitely not "SAT1").
• Must include tube_slot. Values for LAT are, e.g. "i6". The value for all SATs is the same: "st1".
• sample_ranges is ... not right. Just leave it out, as it's not really needed downstream.

In the frame data:

• ancil encoder data (az, el, corotator / boresight) should be in degrees. Issue for the docs is here; sorry to not run it through.
• Instead of corotation_enc the field should be called corotator_enc.

(I am also going to modify the book loader to relax the requirement (in 3.4.1) that Scan Frames must contain tes_biases and primary entries.)