[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

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