Add config option for people with color vision defficiency

[moldovannorbert]

To my best knowledge there is no easy way (through the config file) to set a CVD-friendly color palette for the output.
I would suggest a grayscale image with different shapes as losses and gains.

[ilykos]

@moldovannorbert I have attempted to rewrite the output to use + and - signs, here are some issues I have discovered:

• May be difficult if a smaller windows sizes are used. On 10000 bins size, the plot will look very crowded and the shape of symbols may not be discernable.
• A way around this is to give each symbol white background, but this may mask the symbols underneath and give an impression of sparser dataset.
• I have also tested a contourplot over bin datapoints, but that leads to significant averaging of the outlier positions.

What I ended up with is presenting each chromosome with a vertical KDE plot on genomeWide, and displaying individual bin datapoints in the single chromosome plot.