Change input parameters of Synfit

When fitting a spectrum, it is also needed to add the Synplot
parameters. This was being given as a dictionary. I changed it to be
added as a kwargs.
Creates function that plot chisquare

This function plots just one parameter.
Decrease dimension of chisquare matrix

It had one extra unnecessary dimension that I possibly added by mistake.
Plotting of chisquare accepts two parameters

If there is two parameters, it will plot a color plot. The chi-square is
on a log scale to emphasize the limits.