Help for constructors

constructors
The constructor of a Mathnium class or the array of constructors of a Java class.
y=constructors(clazz)

Inputs
`clazz`	A class.
Outputs
`y`	The array of constructors of the class.

Example

>>class A
>   var x
>   function A(x);this.x=x;end
>end
>>constructors(A.class)
[A.A(x)]
>>constructors(Vector.class)
[Ljava.lang.reflect.Constructor;@cb6009
  public java.util.Vector(int)
  public java.util.Vector()
  public java.util.Vector(java.util.Collection)
  public java.util.Vector(int,int)

>>a=constructors(A.class)[1](2)
>>a
x:
         2
>>v=constructors(Vector.class)[2]()
>>v
[]