Glossary add-on

[jo-mueller]

The extracted properties from the stress analysis are still a bit arcane for people not familiar with the topic - more information in the glossary section and links in the toolbox widgets could be helpful there.

Properties to be explained are:

• Interfacial tension
• How mean curvature on a surface is defined and how it is calculated from a spherical harmonics expansion
• Geodesic distances
• Stress anisotropies and how they are calculated
• Temporal autocorrelations
• Spatial autoorrelation
• Nearest and all neighbor distances and stress anisotropies

@niksicarmin

[jo-mueller]

See #384