Move volcano information from a code file to a parameter file

[rumachan]

We have had reason to change the summit height for the volcano we are working on (Ruapehu). This is because the summit height is used to calculate the default plume height, but in the case of Ruapehu, the gas plume is emitted from the crater lake at 2523 rather from the summit at 2797. We are using 2523 in the Windows Novac code, so we want them to be the same.

The data are in PPPLib/src/VolcanoInfo.cpp, so making the change requires a code rebuild. If these volcano data where is a parameter file, rather than a code file, a code rebuild would not be required.

Many thanks