FEM application is not self contained

[VikingScientist]

apps/fem/fem.cpp is not self contained as it requires the existence of mesh files to run. These files are simply referred to as *.node and *.ele, but their structure is not documented anywhere. The closest thing to a documentation I've found is in mesh.h, but the format described here is outdated and/or wrong.

I would like to either see a good mesh-file documentation or an example mesh-file provided in the apps/fem/ folder.

[fredrikbk]

The fem app is unfortunately only half-done and needs to be completed. To fix it we need an extension to the mesh loader to load initial conditions (I've filed #32 for this).

The .node and .ele files are the tetget format documented here. There are two examples in the apps/data directory (tet-bunny and tet-dragon).