[rrd-developers] NAN-safe ADD

[Timo Stripf]

Hello,

i've implemented a nan-safe add operator (ADDNAN) into rrd. I used it 
to add several incomplete graphs.

NaN + NaN => NaN
  x + NaN => x
  NaN + y => y
  x + y => x + y

The patch is attached.

Best regards
Timo Stripf
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