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* Draft integration of the Alchemical Transfer Method (ATM) plugin

* Attempt to store and retrieve forces--does not compile

* Implement addForce()/getForce() methods

* Throw exception when specifying properties without a Platform (#4130)

* Fixed DOF calculation for NoseHooverIntegrator (#4128)

* Fix variance in documentation of VerletIntegrator (#4138)

* Python API for ATMForce

* Fixed compilation error

* Minor cleanup of formatting and documentation

* Files for ATMForce test cases

* More cleanup

* Removed variable groups

* Test ATMForce with two particles

* More tests for ATMForce plus fixes

* Added missing header

* Rework interface to pass displacements as vector of parameters

* Revert "Rework interface to pass displacements as vector of parameters"

This reverts commit 5e092031f31ded1137b677588f007add1c2d6f82.

* Test with nonbonded force

* Allow energy expression to be customized

* Optional displacements at the initial state

* Fixed compilation error build C wrapper

* Address edge case of default energy expression

* Consistent naming of the variables of the displacement states

* Test of soft core function of the default energy expression

* Mark addForce() as taking ownership

* initial python test for ATMForce

* Test custom expressions

* Expanded C++ API documentation for ATMForce

* Energy parameter derivatives

* Serialization for ATMForce

* Documentation, cleanup, and fixes

* Fixed typos

* getPerturbationEnergy() computes energy

* Another test case

* Minor edits

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Co-authored-by: Peter Eastman <peastman@stanford.edu>
Co-authored-by: Michael Plainer <plainer@ymail.com>

* Use PocketFFT instead of FFTW

* Minor cleanup

* Use PocketFFT instead of fftpack for reference platform

* Remove FFTW as a dependency

* Converted a test case to use PocketFFT

* Fixed an incorrect comment

* Optimized CudaSort for non-uniformly distributed data

* Optimized OpenCLSort for non-uniformly distributed data

* Further tuned distributing elements between buckets

* Copied optimizations over to OpenCL

* Created MonteCarloFlexibleBarostat

* Improved test cases

* Documentation for MonteCarloFlexibleBarostat

* Added a missing include

* Serialization for MonteCarloFlexibleBarostat

* Added MonteCarloFlexibleBarostat to C++ API docs index

* Added citation for MonteCarloFlexibleBarostat

4*(1<<30) evaluates to 0 so the check returns true on 2GB cards. Test runs fine on 2GB cards but requires over 4GB of system memory.

* Fixed range overflow with very large numbers of atoms

* More fixes to overflow with large numbers of atoms

* Fix test failures

* Convert Nose-Hoover into LF middle scheme by copying NH kernels

* Rebrand VelocityVerletIntegrator as NoseHooverIntegrator

* Consolidate NH tests

* NoseHooverChainKernel begone

* Make Windows builds happy

* Add missing header for Windows build

* Fix mistake in CommonKernels header

* Add 6th Yoshida-Suzuki and make it the default

This patch creates a new build in the Travis-CI matrix that compiles and
runs the OpenCL tests using the CPU OpenCL device (AMD drivers). Because
not all of the tests can complete in the allotted 50 minutes, the ctest
invocation is changed to run them in a random order.

This also adds a new executable, TestOpenCLDeviceQuery, that prints
out information about all of the OpenCL devices on the system.