Revert "Marked test_MultiHexagonAperture as expected to fail"

This reverts commit c87589971e9e867db2e4ebc75b29ba13a3e6236e.
Revert "Switch MultiHexagonAperture to use general case for _hexCenter"

This reverts commit 6a0f2c3498e45cf9a368b78f801a890bccf14980.