Vector coercion in PositionSelection

I use MooseX::Params::Validate in order to coerce vector sources
into a Vector. The import_vector method thereby has become obsolete
and has been deleted.
IntersectionLineLine works
IntersectionCircleLine works
all Derivates updated

base class has no input attribute any more
Merge branch 'specific_input_for_derivates' into towards_0.024