but now it is based on the topomap file (see tbsetup/gentopofile).
When the router type is static-ddijk, and there is a topomap file
present (gettopmap() returns valid) turn the topomap into input to
feed into the ddijkstra program. Take the output and feed that into
the parsing code.

NB: If we change the output of tmcd routing call, we have to change
the output of this program too. This will likely become a problem at
some point.