pssac: don't draw line if -G is used and -W isn't #241
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Description of proposed changes
Sometimes users may want to fill a seismogram but don't want to plot the line. Old pssac always draw the line no matter -W is used or not. The new pssac will not draw the line if -G is used but -W isn't.
The new pssac is slightly incompatible with the old one. Not sure if we should incorporate it into 5.4 branch.