Sets 'standard' graphic properties
CL_g_stdaxes(a, colg, ft, fl, fg)
Sets some commonly used graphic properties: grid (present), subticks, size of texts, box ("on").
The subticks values are recomputed as the default values don't always seem well chosen.
(optional) Handle of axes. Default is current axes (gca()).
(optional) Color index of grid. Default is 0 (black).
(optional) Title size. Default is 3.
(optional) Size of x-axis and y-axis labels. Default is 2.
(optional) Size of text (font_size). Default is 2.
CNES - DCT/SB (AL)