Plot label defaults need revision to keep them on the visible canvas

[durack1]

The following code leads to plot titles and axis labels falling off the canvas:

x = vcs.init(bg=True,geometry=(1500,1500))
for anti in [1,8,64]:
    x.setantialiasing(anti)
    x.plot([1,3,5,7,10,24,36,3,6,8,9,10])
    x.png('_'.join([timeFormat,'antiAliasing',str(anti),'.png']))
    x.pdf('_'.join([timeFormat,'antiAliasing',str(anti),'.pdf']))
    x.clear()

See image below for example - red text denotes suggested changes

The y-axis label is missing completely, and the variable_215 label is centered off the canvas, whereas it would be better for this to be left justified following the example of the variable_215 and mean 10.17 .. string in the top left hand corner (which is right justified)