[B.A.T.M.A.N.] [PATCH] Allow vis daemon to serve mesh topology simultaneously in dot_draw and JSON format

After some great input from Marek I took a swing at rewriting my vis patch to allow serving of mesh topology simultaneously in dot_draw & json. * -j enables JSON server on port 2005 * dot_draw continues to be served on port 2004 irrespective of whether -j is specified or not. Some thoughts: * It is not the prettiest of patches but it works. Thinking about cleaner approaches makes my imagination drift in the direction of a simple plugin API such as OLSRd has, anyone else having any similar thoughts ? :) * I'm serving json on port 2005 - any alternative suggestions ? Patch attached for review, looking forward to feedback! - a -- http://7degrees.co.za "Libré software for human education."