isolate sparse code
clean up column extract just a bit
clean up code a bit
more work on sparse ops
sparsify more ops
separate ColumnMatrix from Matrix classes
more sparse ops
extract columns before densifying copy
remove extracttemps idea from prematrix
keep up with src
fix runtime accounting
  remove problem write/parse as much as we can from external package timings
  fix bug we were accounting dual-recheck to WVLpSolver
re-run timings