networks now print themselves
Reset all data to ndmin=1 in __setitem__
- why does this keep getting set back to 0?
- Starting to force all props to be vectors
- Try to create a property of Nt/Np length on demand
Decent version of __setitem__
- It now converts all arguments to vectors
- It does necessary checks on names, prevents wrong length vectors
- An empty label array can be created with pn['element.label'] = False since the False will be converted into a vector of the correct length in __setitem__
Merge branch 'feature/ImproveGetitem' into feature/better_props

Conflicts:
	OpenPNM/Fluids/__GenericFluid__.py
	OpenPNM/Utilities/__Tools__.py
Fixed throat label addition during TestNet generation