'paperpositionmode' change to rid gnuplot_set_term: size is zero

[Daniel J Sebald]

In using print for EPS files, I see the error message:

gnuplot_set_term: size is zero

The reason is that the paperposition is set at [0 0 0 0] and the default setting is 'manual'.  Perhaps the default should be 'auto'.

In any case, here is a patch that will sett a reasonable default for the 'auto' setting.  It may not be the best solution, so perhaps John or Dave could have a look since they're two of the few people that have larger change-sets for gnuplot_drawnow.m.

Dan
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