minor changes in demonstrator needed for publication in Structural
Concrete
Merge branch 'master' of https://rosoba@github.com/simvisage/simvisage.git
correction in random - field ... distribution renamed to distr_type
documentations added to the mn-resistance package
also the cross sectional geometry outsourced from the 
ECBCrossSection class.
unit test example added
mn-resistance package, minor changes, added a test.
sfbdemonstrator ... configuration for comparison of linear and 
nonlinear load level added.
Merge branch 'master' of
https://rosoba@github.com/simvisage/simvisage.git

Conflicts:
	stats/stats/misc/random_field/random_field_1D.py