Fix index out of range bug

Arrays in C++ is zero-based, so the last component (containing the real
gravity) is in [2], not [3].
Script to visualize grid (using MRST)
More realistic grid sizes

A grid cell is now approximately 50x50x10m
More realistic permeability values

Permeabilities are now around 100--200 mD
Use a more realistic injection rate
Use more realistic rel.perm./cap.press curves
Explicitly give i- and j-index for well completions

Some processors (notable MRST) cannot read the deck file if a default
value here is given.
Use a pressure-controlled well for the producer
Disable reordering with non-wetting injection

Currently the implementation using reordering is biased against having
injectors of anything other than the first phase (which is water).
Use a more realistic time horizon
Switch phase positions

OPM is currently biased against injecting anything else than the first
phase, which is hardcoded to be WATER. We therefore define the
properties of CO2 to this phase, and setup the simulation more like a
traditional one.
Use actual depth for Z-axis coordinates
Give approx. hydrostatic pressure initially
Merge pull request #42 from rolk/042_samp

Improve example data input file