Add test for warning when the sample size is less than the maximum unique pairs of the population
Add test for warning when the sample size is less than the maximum unique pairs of the population

pombredanne/dedupe,01-/dedupe,neozhangthe1/dedupe,tfmorris/dedupe,dedupeio/dedupe-examples,datamade/dedupe,dedupeio/dedupe,01-/dedupe,nmiranda/dedupe,davidkunio/dedupe,neozhangthe1/dedupe,davidkunio/dedupe,tfmorris/dedupe,nmiranda/dedupe,dedupeio/dedupe,datamade/dedupe,pombredanne/dedupe