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na.omit-method for STFDF

Tom Gottfried 
Hi,

I wrote a na.omit-method for STFDF (attached) with the intention to 
extract the rows and columns of a sparse space-time grid (STSDF) that 
have data on all nodes via

na.omit(as(stsdf, "STFDF"))

It turned out that I had no point in time with data at all locations in 
my data set. Hence, for me realising this was the only use of the method 
so far. Further I'm not sure about sensible use of the drop argument in 
it. Anyway, in case it's considered useful by others too, it could be a 
starting point for incorporation into spacetime.

I'm looking forward for your opinions!
Tom
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