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SWIG/directors dependency removal (cont'd)

Removed all castToSomething() methods from Interface0D's subclasses.
These methods are useless, because introspection-based automatic type
conversion takes place whenever it is applicable.

If you need to rewrite old style modules that rely on the cast methods,
apply the following rewriting rules:

- SVertex.castToSVertex()
- TVertex.castToViewVertex()
- TVertex.castToTVertex()
- NonTVertex.castToViewVertex()
- NonTVertex.castToNonTVertex()

These 5 methods return an object itself, so just removing a method
call will suffice. If you need to handle objects in a different way
depending on their types, then you can use Python's type checking
idioms such as "type(obj) is T" and "isinstance(obj, T)". Example:

[Original]
v = it.getObject()
# try to convert v into a TVertex object
vertex = v.castToTVertex()
if vertex != None:
... # do something on the TVertex object
# try to convert v into a NonTVertex object
vertex = v.castToNonTVertex()
if vertex != None:
... # do something on the NonTVertex object

[Rewritten]
vertex = it.getObject()
if type(vertex) is TVertex:
... # do something on the TVertex object
elif type(vertex) is NonTVertex:
... # do something on the NonTVertex object

- SVertex.castToViewVertex()
- SVertex.castToTVertex()
- SVertex.castToNonTVertex()

Use SVertex.viewvertex() instead. You don't need to care about
which cast method is appropriate. SVertex.viewvertex() does, if
necessary, introspection-based automatic type conversion for you.

- NonTVertex.castToSVertex()

Use NonTVertex.svertex() instead.

- CurvePoint.castToSVertex()

Let cp be a CurvePoint object, then this method can be expressed as
follows:

if cp.t2d() == 0.0:
return cp.A() # returns an SVertex
elif cp.t2d() == 1.0:
return cp.B() # returns an SVertex
return None

- CurvePoint.castToViewVertex()
- CurvePoint.castToTVertex()
- CurvePoint.castToNonVertex()

Similarly, these 3 methods can be expressed as follows:

if cp.t2d() == 0.0:
return cp.A().viewvertex()
elif cp.t2d() == 1.0:
return cp.B().viewvertex()
return None