Merge pull request #40 from mediev/master

Changes in render script
Add external force vectors (for border nodes) into snapshots
Update border calcs, pass parameters from task
More or less working plastic wave test
Remove excessive time steps in plastic wave test
Rename basic plastic wave test
Separate tasks for plastic waves on tetr and cubic meshes
Remove ugly hack around outer normals
Fixes and hacks to make anisotropic delamination working
Quick and dirty samples for anisotropic delamination problem