New function to clean data about spocc HOT 4 CLOSED

also, edits in 6e86083

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Related to #77 - Make checker for possibly duplicate occurrence records only across different sources. So pass on this step if only 1 data source. If GBIF + 1 or more additional data sources = then check for possible duplicates. Give another slot in the output of the function for these potentially duplicate records.

from spocc.

For removing/flagging potential duplicates among providers, looks like sp::zerodist() may be what we want. E.g.

d1 <- 'a spatial points obj'
d2 <- 'another spatial points obj'
zerodist2(d1, d2, zero = 0.000001)

Then that zero parameter can be adjusted to say what the threshold is for comparison, with 0.0 meaning they have to be exactly the same, or adjust the number to vary the match.

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closing, moved to ropensci-archive/mapr#4

from spocc.