Re-grid and re-tile groundtruth data with coordinates rounded to 250

[weiji14]

So that we align better with BEDMAP2 and other raster grids out there, we are re-processing new groundtruth NetCDF grids (produced by data_prep.ipynb) with coordinates (in EPSG:3031) rounded to 250 units/metres. This means no more or less crazy decimal coordinates that should make our various scripts (especially those dependent on bounding boxes) play a lot more nicely together.

Fixes #152.

TODO:

• [x] Make new groundtruth grids with coordinates rounded to 250 units in EPSG:3031 (0681bf327f685b219565ca5a409d77aa9b6525e4)
• [x] Re-tile grids using new bounding boxes, update geojson tiles and quilt data package (f3a443a82f7756587cabbb46e1fb3895dfce296e)
• [x] Check how our v0.9.0 model (see #151) performs on the new 2007tx.nc test region (77b4fe12ed2dc5d5e926d9880f55973b95708887)

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