PG-PuReMD: fix performance logging code around GPU code. Rearrange header files to allow some preprocessor definitions to be defined via options in configure script. Rework Autoconf and Automake code to allow passing flags directly to nvcc compiler wrapper (for CUDA code). Enable C11 and C++11 standard targets during compilation.

PG-PuReMD: fix compilation error (remove variable). Fix issue with dual CG solver for QEq (local arithmetic in SpMV was incorrect). Revert CG solver convergence criterion to use norm of the preconditioned residual vector.

PG-PuReMD: small fix for initializtion routine performance logging (timers not reset after outputting to log file).

PG-PuReMD: corrections for utilizing a SAI preconditioner in MPI code (errors introduced during previous code merges).

PG-PuReMD: revert CG solver convergance criterion to used preconditioned residual norm. Re-enable dual charge solver for QEq.

PG-PuReMD: rework performance logging code in linear solver routines to avoid excessive MPI communications.

PG-PuReMD: adjust performance logging to compute mean timings across all processors. Other code clean-up.

PG-PuReMD: fix issue with certain data structures not being reallocated when the local number of atoms owned by a processor increases after exchanging messages with neighbor processors. Fix an issue where the MPI send message buffer may be overwritten by a received message (Coll). Small fix to not overwrite the program status return value with local function return values. Other code clean-up.

PG-PuReMD: fix out-of-bounds mmeory accesses and unitialized data usage in energy and force tabulation routines for van der Waals and Coulomb interactions.

PG-PuReMD: fix issue with some interaction lists not being initialized on first step of simulations from restarted runs. Fix typos in C++ code for utilizing C code (__cplusplus). Clean up C code for utilizing C++ code (unconditional extern's for unmangled member naming). Ensure that CUDA thread and block sizes are correctly set. Tweaks to memory transfers and allocation logic in integration code (GPU). Fix logic error with charge matrix allocation in GPU code. Other code clean-up.

PG-PuReMD: add BiCGStab solver for GPU code. Corrections to CUDA block and thread sizes for some kernels. Fix some variables being used with uninitialized values.

PG-PuReMD: fix issue with charge solver preconditioner refactoring rate causes issues with reneighboring actions (preconditionering rate was previously coupled with reneighoring rate for SAI but this causes issues for Jacobi, etc.). Be more greedy with memory allocation sizes to decrease reallocation frequency (MPI buffers, etc.). More GPU code clean-up.

PG-PuReMD: fix MPI buffer allocations sizes. Ensure that nonblocking MPI messages have completed for each dimension before continuing. Rework reallocation checks in integration routines. Temporarily disable CUDA-aware MPI code paths (need to perform packing/unpacking first on device before handing off pointers). Other code clean-up.

PG-PuReMD: fix host-device transfers for charge solver code (SpMV data transfer sizes). Remove unused code. Other general code clean-up.

PG-PuReMD: fix issue with divergent MPI_Reduce calls by multiple MPI processes (timing logging code). Add run-time MPI routine error checking. Fix issue with upper limit of hydrogen atoms allowed being hard-coded in GPU code (use dynamic memory allocation instead). Other code clean-up.

PG-PuReMD: clean-up MPI custom datatype initialization and error reporting. Avoid truncations in buffer size calculations. Other code clean-up.

PG-PuReMD: improve memory management around temporary storage space on both the host and device (i.e., scratch space).

PG-PuReMD: replace deprecated CUDA warp-level primitives with modern ones. Fix issue with modern GPU microarchitectures using incorrect code paths (post-Kepler). Other code clean-up.

PG-PuReMD: revert to 1 thread per atom implementation in nonbonded energy and force calculations in order to correct issue with forces being incorrectly calculated (revisit 1 warp per atom implementation later). Disable charge matrix row-wise sorting. Other general code clean-up.

PG-PuReMD: corrections to van der Waals and Coulomb energies calculations (far neighbor list in full format, not half). Fix QEq charge matrix initialization (full format). Other refactoring and code clean-up.

PG-PuReMD: fix issue with SpMVs operations using incorrect row-wise bounds (end pointer incorrect in light of sparse_matrix struct changes).

PG-PuReMD: merge changes from sPuReMD and PuReMD for validation work for simulation accuracy. Small correction to lone pair energy calculation. PuReMD: code formatting changes to better align with sPuReMD. sPuReMD: fix issue with valence angle calculations not setting list indices under certain sitations (taking previous continue statement missed index assignment).

PG-PuReMD: backport fixes from sPuReMD to control file parsing. Tools: formatting tweaks for MPI-GPU code.

PG-PuReMD: refactoring to unify CUDA code naming conventions and to simply code in cuda_system_props.cu.

PG-PuReMD: fix issue with portions of interaction lists not being initialized for Cuda_Init_Forces. Utilize more targeted debugging prints (DEBUG -> DEBUG_FOCUS). Other general code cleanup.

Fix build issue where config.h.in is only generated once (for sPuReMD) => common file across all versions.

Build toos: refactor to remove recurisve Makefiles. Fix issue with OpenMP flags being overridden when user supplied value for CFLAGS variable.

Build systems updates for sPuReMD, PuReMD-GPU, and PG-PuReMD (use safer optimization level defaults).