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.