Cannot iterate over IPv6 address in ipcalc.Network()

[twinshadow]

import ipcalc
foo = ipcalc.Network('fd00:dead:ca7:cafe::1/64')
foo.__iter__().next()
Traceback (most recent call last):
  File "", line 1, in 
  File "/usr/lib/python2.7/site-packages/ipcalc.py", line 544, in __iter__
    for ip in (IP(long(self)+x) for x in xrange(0, self.size())):
OverflowError: Python int too large to convert to C long

[gandaro]

Fixing commits have been merged.