draw_2lines_time(ncfiles, values, varnames)
  values= [timevardim]:[varangeA]:[varangeB]:[timeaxisfmt]:[timeaxis]:[figvarns]:[colors]:
      [widths]:[styles]:[sizemarks]:[marks]:[graphtitle]:[labelaxis]:[legvals]:[figname]:[figkind]:[close]
    [timevardim]: name of the common variable-dimension time
    [varangeA]: ',' separated list of range (min,max) for A values ('None', automatic from
      'variables_values'; 'Extrs' from values extremes)
    [varangeB]: ',' separated list of range (min,max) for B values ('None', automatic from
      'variables_values'; 'Extrs' from values extremes)
    [timeaxisfmt]=[tkind];[tfmt]: format of the ticks for the time axis:
      [kind]: kind of time to appear in the graph
        'Nval': according to a given number of values as 'Nval',[Nval]
        'exct': according to an exact time unit as 'exct',[tunit];
          tunit= [Nunits],[tu]; [tu]= 'c': centuries, 'y': year, 'm': month,
            'w': week, 'd': day, 'h': hour, 'i': minute, 's': second,
            'l': milisecond
      [tfmt]; desired format
    [timeaxis]: which is the time axis in the plot ('x' or 'y')
    [figvarns]: ',' separated list of names of the variables in the plot
    [colors]: ',' list with color names of the lines for the variables ('None', automatic)
    [widths]: ',' list with widths of the lines for the variables ('None', automatic)
    [styles]: ',' list with the styles of the lines ('None', automatic)
    [sizemarks]: ',' list with the size of the markers of the lines ('None', for 2.,2.)
    [marks]: ';' list with the markers of the lines ('None', automatic)
    [graphtitle]: title of the figure ('!' for spaces)
    [labelaxis]: label in the figure of the common axis ('!' for spaces)
    [legvals]=[locleg]|[fontsize]:
      [locleg]: location of the legend (0, autmoatic)
        1: 'upper right', 2: 'upper left', 3: 'lower left', 4: 'lower right',
        5: 'right', 6: 'center left', 7: 'center right', 8: 'lower center',
        9: 'upper center', 10: 'center'
      [fontsize]: font size for the legend (auto for 12)
    [figname]: name of the figure
    [figkind]: kind of figure
    [close]: Whether figure should be finished or not
  ncfiles= ',' separated list of files to use
  varnames= ',' separated list of variables names in the files to plot
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