[time-nuts] HP5065A C-field current is temperature sensitive

[Poul-Henning Kamp]

Using the Fluke 732A as voltage reference improved HP5065A stability,
but not very much, so I looked closer at the constant-current
generator and the C-field pots "calibration":

	http://phk.freebsd.dk/hacks/HP5065A/20150828_c_pot/index.html

... and found out that the current-sensing resistors R10||R11 have
a very high temp-co.

Getting closer...

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