The starting point of this changed is the following discovery on
- On a given fixed system.
tmax=500: it doesn't find a good absorbing boundary and then says to use the simple one, the lead size is 8000
tmax=5000: it finds a good absorbing boundary with a total lead size of 2600
That means that it is still interesting to make
automatic_boundary() test bigger
tmax and may find a more advantageous
AbsorbingBoundary lead size when compared to
SimpleBoundary. This draft implements that, and also tests different degrees (that supposes that everything still works with a degree != 6).