updated make_fgmax_grid.py files to use FGmaxGrid class
added new plot_fgmax.py files to use 5.2.1 version of fgmax_tools
removed old versions of plot_fgmax_grid.py files
change x,y to X,Y for geoclaw@35ae1063fa682
use 1/3 sec fgmax grid in HAI1125-26