If this is set to true (default is false), then the graph widget automatically
scales its content to make it fit exactly. If "max_value" is also set, this is
the minimum "height" the graph will use.
This can be useful for graphes which monitor things like network bandwidth
which can vary a lot.
Signed-off-by: Uli Schlachter <psychon@znc.in>
Signed-off-by: Julien Danjou <julien@danjou.info>