GitLab

Created reference implementation of DIIS for converging AMOEBA dipoles.  Also some minor code cleanup.

Removed 'void' declarations from getCutoff/getCutoffDistance methods so that swigInputBuilder.py would correctly wrap return values.

from all .cpp and .h files.

'const char*' by passing it straight to the std::string constructor rather than
through a reinterpret_cast.  This solves segfaults when trying to use the OpenMM
C-API (which is auto-generated from the generate*Wrappers.py scripts) when used
with gcc/g++.  clang and clang++ seem to accept this (perhaps why it was not
caught before).

After these changes, the OpenMM-Tinker binding works again with the current git
version of OpenMM.

Plugins work with CPU platform.  This involved separating the reference implementations of plugins into their own libraries.

AmoebaMultipoleForce did not report particle groups, which could potentially lead to incorrect reordering

Platform specific header files get installed.  This allows plugins to be built with just an OpenMM installation, not a full source tree.

Converted the array containing atom block indices for the neighbor list from ushort2 to int.  This removes the hard limit of 2 million atoms.