-include UnsaturatedEngine to start Chao's work
fix a few mistakes and make a real (not empty) test function
- my first work on drainage simulation
- replace hand-defined positions by scene's positions
Merge branch 'master' of https://github.com/yade/trunk into chaoUnsat

Conflicts:
	pkg/dem/FlowEngine.hpp
Commit the first working code for drainage
- make the FAR constant more flexible (a parameter in addBoundaries)
Add Changelog.
Fix bug #1161847 : Cannot create two clumpClouds in the same simulation (https://bugs.launchpad.net/yade/+bug/1161847).
Modified makeClumpCloud(...) in SpherePack.cpp : the random generator was wrong, fixed it.
added --diable-pynotify to yade-batch
Removed #include Shop.hpp from Cell.*pp
added area attribute to Facet
added triaxal test on cylinder example
Add different capillar models into ViscoElasticPM.
Add links to equations, consider not only monodisperse particles.
Fix s parameter for Willet-formulation of capillar.
Add one more critical-calculation to capillar model.
Cleanings in viscoelastic capillar modell.
Move capillar calculation into another function not to overload VPM.
Modify Weigart`s model.
Update equations for Weigart`s capillar model.
Update capillar equations and names of schemas.