MSSM paper

This pull request contains a few bits and pieces to improve the MSSMvsSM plots for the MSSM paper. These things are:

-Only using toys from the new tanb grid to make the plots-this removes bad features from the inclusion of the low stat old tanb points.
-Adding an option to run toys for specific tanb points within a certain mA point. We can use this to "top up" tanb points in the new grid which weren't present in the old grid and so haven't been running cycles as long.
-Adding a similar option to add user chosen additional points to the tanb grid.
-Small change to the script to copy toys to merge them with those of another user.

This can be merged straight away or else wait until Felix is back to check he is happy with the changes.