Start work on imaging models

Still lots of work to do on this, but we should have
SKS, icequake and local S and local P, I think.
Add 'quiet' to glacal_splitting ex

This suppresses blow by blow splitting parameter
output.
Make it possible to distiguish freq in plots

And add a legend
A test case for Euler to elasticity calc

This checks we get the same result as Geoff's
calculation using his (fortran?) executables.
Changed some plot options
Merge branch 'glacial-imaging-models' of git://github.com/andreww/MSAT into glacial

Conflicts:
	examples/glacial_splitting/glacial_splitting.m
added full ebsd data from Obbard and Baker (2007)
added graphs of temperature and velocities vs depth
Merge pull request #20 from alanfbaird/glacial_test

Glacial update