Develop

Hi Oli, 

The changes that I've proposed (pandas trick and legend reading from XVG) were already there on the develop branch of orbeckst/GromacsWrapper (accounting for 2/7 commits separating the develop from master). 

I was expecting that the changes are stored on my fork but i didn't have one at the time and it seem that I used my write powers on your repo ;) So this pull request is here but all the changes are already on 'develop' that you own. 

Or am I confused in some way? Or do you just want to merge it into master?

Thanks,

- Jan