WIP: virt-manager: bump version 0.9.x -> 1.0.0

FIXME: It starts, but shows a message that it cannot connect to the
hypervisor. Searching for this issue online seems to indicate that it is
expected. One can create the connection manually with File->Add Connection.

The last(?) step of creating a new VM fails:

Error starting installation: Requiring namespace 'Gtk' version '2.0', but '3.0' is already loaded

Traceback (most recent call last):
  File "/nix/store/fmpwa7j92xqvzgix7wrd029rykihajjz-virt-manager-1.0.0/share/virt-manager/virtManager/create.py", line 1708, in finish
    self.customize(guest)
  File "/nix/store/fmpwa7j92xqvzgix7wrd029rykihajjz-virt-manager-1.0.0/share/virt-manager/virtManager/create.py", line 1738, in customize
    self.config_window = vmmDetails(virtinst_guest, self.topwin)
  File "/nix/store/fmpwa7j92xqvzgix7wrd029rykihajjz-virt-manager-1.0.0/share/virt-manager/virtManager/details.py", line 487, in __init__
    from virtManager.console import vmmConsolePages
  File "/nix/store/fmpwa7j92xqvzgix7wrd029rykihajjz-virt-manager-1.0.0/share/virt-manager/virtManager/console.py", line 27, in <module>
    from gi.repository import GtkVnc
  File "/nix/store/wzy398nz5vzqpwqxyfkb2ys1az3rkpd0-pygobject-3.10.2/lib/python2.7/site-packages/gi/importer.py", line 68, in load_module
    dynamic_module._load()
  File "/nix/store/wzy398nz5vzqpwqxyfkb2ys1az3rkpd0-pygobject-3.10.2/lib/python2.7/site-packages/gi/module.py", line 287, in _load
    self._introspection_module = get_introspection_module(self._namespace)
  File "/nix/store/wzy398nz5vzqpwqxyfkb2ys1az3rkpd0-pygobject-3.10.2/lib/python2.7/site-packages/gi/module.py", line 266, in get_introspection_module
    module = IntrospectionModule(namespace, version)
  File "/nix/store/wzy398nz5vzqpwqxyfkb2ys1az3rkpd0-pygobject-3.10.2/lib/python2.7/site-packages/gi/module.py", line 117, in __init__
    repository.require(namespace, version)
RepositoryError: Requiring namespace 'Gtk' version '2.0', but '3.0' is already loaded