iso_abundMulti doesn't work if title is set

[digbyr]

For iso_abundMulti in nugridpy/data_plot.py (lines 2628-2704):

If a title is specified (title!=None), the variable "name" is never declared, and the script breaks when it tries to save the plots in line 2698/2700.

[digbyr]

Same issue in abu_chartMulti.