Update the wikistats to remove the ru_statistics and the (no longer
used) NumPy package. 

Add PBG number to the sector output numbers.
Tweak the layout of the worlds in each hex on the maps. The data was
laid out in a way to leave the data crossing the hex lines. This made
some numbers hard to read. Now this should be better. Also there is more
data than the original NRoute code, so use four lines, not three.
Add, tweak, and allow a new border generation system called `erode`,
which is described on the TravellerMaps site.
Describe the new erode border generation system.