PCR2 and 3 submission for review (#502)
PCR2 and 3 submission for review (#502)

* PCR2 and 3 submission for review

* modified the PCR2 and PCR3 tests based on PCR1 recent changes to return single polygon rather than multipolygon

* revision in response to review comments as of April 10

* consolidate PCR.1 and PCR.3 common logic into a shared function as suggested

* minor fixes

* revision in response to the latest review comments before merging

* revision in response to review comments as of April 16

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