Proves per a medianes_mobils_n
------------------------------

>>> import mitjanam

>>> it = iter([1,21,5,34,46,7,24, 9])
>>> it2 = mitjanam.medianes_mobils_n(it, 4)
>>> if iter(it2) is not it2:
...     print(it2, "no és un iterador")
>>> for t in it2:
...     print(float(t))
13.0
27.5
20.5
29.0
16.5

>>> it = iter([1,21,76,34,46,77,50, 9])
>>> it2 = mitjanam.medianes_mobils_n(it, 5)
>>> if iter(it2) is not it2:
...     print(it2, "no és un iterador")
>>> for t in it2:
...     print(float(t))
34.0
46.0
50.0
46.0

>>> it2 = mitjanam.medianes_mobils_n(iter(range(10,20)), 3)
>>> if iter(it2) is not it2:
...     print(it2, "no és un iterador")
>>> for m in it2:
...   print(float(m))
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0


>>> it2 = mitjanam.medianes_mobils_n(iter(range(10,20)), 7)
>>> if iter(it2) is not it2:
...     print(it2, "no és un iterador")
>>> for m in it2:
...   print(float(m))
13.0
14.0
15.0
16.0


>>> it2 = mitjanam.medianes_mobils_n(iter([4, 8, -12, 9, 21, 7, -8, 3, 3, 14]), 2)
>>> if iter(it2) is not it2:
...     print(it2, "no és un iterador")
>>> for m in it2:
...   print(m)
6.0
-2.0
-1.5
15.0
14.0
-0.5
-2.5
3.0
8.5