QA/AC: Function to test equations 9 through 16

These equations determine pairing proportions (P) in breeding habitat.

test_P(
  dat,
  FUN = eq09_Pcgg,
  plot.test = TRUE,
  subsample = TRUE,
  sample.N = 10,
  return.df = FALSE,
  ...
)

Arguments

dat	dataframe with values against which to test function. An object named test_dat_P is available for testing.
FUN	function to test
plot.test	plots a histogram of the proportions calculated by tyeh function
subsample	should the test data be randomly subsampled for quick testing
sample.N	how many subsamples of dataframe to take
return.df	return the full dataframe with original test values
...	Other