Added method 'setGrid()' for improved grid configuration.  Modified 'set_lim' to work with inverted axes.  Added method 'rescale()' --- which doesnt work right now --- to rescale part or all of a given axis.
Added method 'setGrid()' for improved grid configuration.  Modified 'set_lim' to work with inverted axes.  Added method 'rescale()' --- which doesnt work right now --- to rescale part or all of a given axis.

lzkelley/zcode,lzkelley/zcode