Multiple class definitions with the same name are possible

[AlexeyLebedev]

It is possible to have multiple class definitions with the same name within the same scope without an error generated:
{{{model A

record T

Real r;

end T;
type T=Real;

end A;}}}
It is also possible to have one class definition in a scope and another inherited:
{{{model A

record T

Real r;

end T;

end A;

model B

extends A;
type T=Real;

end B;}}}

[Per Östlund]

The first example is no longer allowed by SCodeFlatten (+d=scodeFlatten), so it will be fixed when SCodeFlatten is turned on by default.

[Martin Sjölund]

ScodeFlatten is now used by default