Simul efun: remove_element - remove an element of an array

Synopsis:
	mixed* remove_element(mixed* array, int index)

Description:
	Removes an element from an array, disturbing the sequence.
	That means, the order of elements in the array is not kept,
	so you can only apply it to "sets" in a mathematical sense.

Note:
	Better use 'array[from..to]' as described in 'slice_array'.

See also: lib/slice_array