* Avoid processing twice indices of values to round
* Replace the rounding set with a priority queue
* Remove unnecessary "old index" map
* Reformat MISolver.cc to conform to the style guidelines and add missing ; after DEB_* statements
* Remove MISolverT.hh
* Move private symbols to the cc file
* Improve code quality, formatting and const-correctness of IterativeSolverT
* Improve code quality and formatting for MISolver::update_solution