Move the ddijkstra from common/libsetup.pm (revision 1.107) into here,
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.