Changed -bg option to set pls->nobg if a negative number was specified. Handling of the geometry string improved; now handles strings of the form:     1) -geometry WxH+Xoff+Yoff     2) -geometry WxH     3) -geometry +Xoff+Yoff or -geometry Xoff+Yoff     4) -geometry 0x0+Xoff+Yoff (previously only types 1&2 were handled).  Contributed by Mark Olesen.
Changed -bg option to set pls->nobg if a negative number was specified.
Handling of the geometry string improved; now handles strings of the form:
    1) -geometry WxH+Xoff+Yoff
    2) -geometry WxH
    3) -geometry +Xoff+Yoff or -geometry Xoff+Yoff
    4) -geometry 0x0+Xoff+Yoff
(previously only types 1&2 were handled).  Contributed by Mark Olesen.

svn path=/trunk/; revision=1438

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot