Aesthetics issues

[elequintero]

List of possible things to further implement the function:

• Error bars - when included and go out of the graph limits causes visualization problems
• Values for isolines (QC) - possibility to move further right?
• Avoid too much clustering - ggrepel options possibility to modify
• Possibility to not show grouping by shape, i.e. all points equal. Or to group by colors instead of shapes - include legend for the grouping factor

[Pakillo]

I am revising the effectiveness_plot function to implement this and a few more changes, will submit pull request soon.
Meanwhile, note that you can set label = NA for some taxa before providing the label vector to the function, so labels will only appear for those taxa having label != NA. That would fix overplotting

[elequintero]

Is it also possible to set changes for the isolines names, i.e. change QC to put TE instead?
Forgot to mention this in the previous issue.