added test_eos

First test to see if reference values are returned for P = 1e5, T = 0 K
Changed name

Changed test name
Removed TODO

Removed TODO
Fixed tabbing

Tabs to spaces
spaces to tabs

Tabs to spaces
Tabs to spaces

Perhaps at least
remove tabs
fix test
Merge PR #63 manually

Add tests for EOS.
Various fixes to manual text.

Cleaned up some references, grammar, etc.
More minor changes

Fixes in manual
More changes

Various and sundry
Fixing math formatting

Adjusted units to :math: format for cleaner look. No more ^ in units,
still more to go
More unit fixing

Fixed units, copy editing
Averaging section edited

So many units fixed.
Geotherm done

Fixed various geotherm units and citations
Typo

typo
typo

typo
Fixed underline typo

Underline typo fixed
Fixed label

Fixed label in equation