Fice tools

[bearecinos]

FYI @dngoldberg

I think this is ready to be merge. Its a very big PR but the code that previously lived in meshtools/meshtools.py has been re-organized as a ficetools toolbox

ficetools now has the right imports (tml_adjoint back ends) following @jrmaddison changes to the fenics_ice repo.

• __init__.py
• backend.py : Organises fenics and tlm_adjoing imports
• graphics.py : A set of tools for plotting input data and all the experiments results from fenics_ice
• mesh.py : A set of tools for mesh generation.
• utils_funcs.py : Useful functions to organised data, compute vertex for fenic_ice parameters, and other utils that did not fit in any other module, lets try to keep this one short!
• velocity.py : A set of tools for the generation of velocity input data over a specific domain.

This should make the development easier as we don't have a huge file of over 3000 lines anymore!

All of this required changes in the prepro_stages and plotting_stages scripts.

A big change now its on the smith.toml and on the param_sweep.py script to generate the "tolms" for the l-curve experiments. These files now reflects the phase_suffix and new output/diagnostic dir changes.

Solves issues #9, #3 , #11 and #10

[bearecinos]

@dngoldberg there is no need to review this I think (there are a lot of changes.. ) I will keep making changes anyways to activate the melt rate param once I get the alpha init constant values and the new velocity input.