Fix comment referencing renamed function.
Fix more whitespace tab->space issues.
Simplify formula with atan2().
Use proper way to access pi() from boost::math.
Merge pull request #685 from atgeirr/vertex-neighbours

Add free function vertexNeighbours() and test.
PVT properties: allow them to be temperature dependent

Note that this patch does not introduce any real temperature
dependence but only changes the APIs for the viscosity and for the
density related methods. Note that I also don't like the fact that
this requires so many changes to so many files, but with the current
design of the property classes I cannot see a way to avoid this...
Merge pull request #688 from andlaus/temperature_dependent_PVT

PVT properties: allow them to be temperature dependent
Silence unused argument warning.
Merge pull request #694 from atgeirr/silence-warning

Silence unused argument warning.
Add skeleton of AnisotropicEikonal class and test.
Added simple test, work in progress.
Work in progress on AnisotropicEikonal.
Solver logic finished.

Methods isClose(), computeFromTri() and computeFromLine() are still dummies.
Initial versions of compute functions done.

Still has bugs.
Work in progress.
Fix bug in distance derivative function.
Fix bug in test.

Also add (inactive) second test.
Follow renaming of function.
Change order of steps in algorithm to avoid rework.
Uncomment second test.

Test fails, it requires exact match which is too strict.