Error message more meaningfull for linux systems when graphviz is not found #86
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Hi, this is not much, but I had to dig to get this information:
I simply added the listing of the paths where dot is searched for in case it is not found.
I realized that one path was missing in the searching order, but only once I had read through your code.
Also, it was mentionning 'Program Files' as a location in the first version of the error message, which is not a place on a linux system.
For issue:
#85