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New advanced options OPENMM_BUILD_CPU_TESTS, OPENMM_BUILD_SERIALIZATION_TESTS,
OPENMM_BUILD_REFERENCE_TESTS were added to the cmake configuration and disabled
in the OpenCL test matrix element to increase speed. Redundant or unnecessary
apt packages removed from the travis installation.

Clean up

Fix OpenCL platform on low-end devices

Close file before deleting in TestAmberPrmtopFile.py

Close PDBx file before deleting to fix windows test failure in TestPDbxFile.py

Fix test checkpoint reporter close file before repoening

Add bytes typemap

Update appveyor.yml

Fix exit status

Supress 4305 and 4244 warnings

Print the last failed tests output

Make numpy optional in test

Improve scipy skip too

Refactor TestCheckpointReporter.py to not require numpy

test on the proper file

Remove annoying -V