test_pointmatch: input dictionaries don't fit format

[RussTorres]

see #155 for context.

The format of pointmatch test dictionaries in integration_tests/test_pointmatch_integrated.py and test/test_pointmatch.py doesn't match what I was seeing in real pointmatch collections, e.g.

"p": [[1, 2, 3], [1, 2, 3]] (pointmatch collection)
vs
"p": [[1, 1], [2, 2], [3, 3]] (test fixture)