An algorithm for computing indefinite sums of rational and quasi-rational summands
Add rational summation to default imports
Clean up imports
Make rational summation work with new monomial tools
Small clean up
Use much more robust linear solver
Remove obsolete debug print statements
Handle case if linear system has no solution
Fix preprocess step to fail for inadmissible summands
Remove the constant of summation if any
Fix broken tests
Better function names
Fix python3 test failures
Remove unused code