• Both the source files and header files are in src.
• The directory data contains sample matrices and vectors.
• Rough two-level and multilevel preconditioners. Each has own PCG solver, which is perhaps not ideal.
• Slightly altered Caitlin's partition.hpp file.
• Note: METIS does not like nparts = 1.
• Use the standard CMake procedure: mkdir build && cd build && cmake ..
• Todo: allow for different smoothers.