Basic file setup
Basic packages
Use pdflatex instead of xelatex

This requires that the 'stix' package (from www.stixfonts.org) is installed
Useful generic macros
Basic nomenclature used in vertical equilibrium literature
Introduction of the levels
Basic equations
Derivation of rel.perm. expressions
Capillary pressure
Define velocity using lateral operator too
Reference point for brine pressure set to same as for CO2
Generalize pressure for both phases into one equation
Use Latin Modern fonts instead of Stix

Stix fonts are not yet commonly available in TeXLive distributions and
thus require manual installation, whereas Latin Modern is available out
of the box.
Provide instructions on how to generate document

The build system has not yet learnt how to build random LaTeX-
documents; this document describes how to do it.
Add reference to paper which documents model
Merge pull request #53 from rolk/053_doc

Technical documentation for how the model maps to the implementation