Merge pull request #483 from m0zes/master

Network map could use a legend. adding one.
Rework of getDevicePicture functions.  Still have a slight bug on selecting the correct image file from the template but that's minor compared to what's been done. close #472
Merge branch 'master' of github.com:samilliken/openDCIM
Adjustment for click targets for useless workorder thing
Add a configuration option to specify dot location

Also adds an error message if the location doesn't exist/isn't
executable.