Comply with PEP 8 style guide
Add EPICA Dome C ice core record
Add GRIP ice core record

Temperature reconstructed according to Johnsen et al. 2002, DOI 10.1034/j.1600-0889.47.issue5.9.x.
Add a minimal test

Produce several files and use matplotlib to plot them on the screen.
Add ODP 1012 sea surface temperature record