Draft: Test replace finds

[mrvanes]

We moeten nog wel even goed dubbelchecken of alles nog is zoals het was ;)
~6m30 -> 4m8 is ongeveer 35% snelheidswinst

# time python -m cProfile -s cumtime plsc_ordered.py plsc.yml &> plsc_ordered.log

real    4m8.500s
user    0m14.300s
sys     0m0.853s

# time python -m cProfile -s cumtime plsc_flat.py plsc.yml &> plsc_flat.log

real    3m50.528s
user    0m12.623s
sys     0m1.668s

[baszoetekouw]

The approach is probably ok, but I'm hesitant to merge this now, as plsc is getting more and more spaghettiesk. And rewriting/refactoring plsc is risky because we lack unittests.