build: fix library linker order

libcommon.a references functions from libarchive, so it must be listed
before the same in the linker call. This fixes build with -Wl,--as-needed.

https://bugzilla.gnome.org/show_bug.cgi?id=735144
Updated Brazilian Portuguese translation
Updated Czech translation
Updated Chinese (Taiwan) translation
Updated Norwegian bokmål translation.
Use the unicode charcter '…' instead of '...'
Updated Hebrew translation
Updated Greek translation
Updated Assamese translation
Updated French translation
Updated Brazilian Portuguese translation
properties: Add snapshots page

This will later be used to show the snapshots of a VM.

https://bugzilla.gnome.org/show_bug.cgi?id=710306
libvirt-machine: Delete snapshots with machine

libvirt does not allow to delete/undefine domains that have snapshot
metadata attached. Sine creating snapshots will be possible, we need to
pass GVir.DomainDeleteFlags.SNAPSHOTS_METADATA to the delete() call of
the domain, so the user can even delete domains with snapshots.

https://bugzilla.gnome.org/show_bug.cgi?id=710306
Add SnapshotListRow

This will be used in the snapshots page of the VM properties and
features a way to delete, rename or revert to the snapshot it
represents.

https://bugzilla.gnome.org/show_bug.cgi?id=710306
properties: Remove margins of property widgets

They were only added on the left of each configuration widget which
makes horizontally expanding widgets look unbalanced.

https://bugzilla.gnome.org/show_bug.cgi?id=710306
properties: Use a GtkScrolledWindow for the pages

This is needed for property pages that contain either very high widgets
or a dynamic number of widgets, e.g. the coming snapshots page.

https://bugzilla.gnome.org/show_bug.cgi?id=710306
LibvirtMachineProperties: Add snapshot API

Add API to fetch, get and create snapshots which will be used in later
commits.

https://bugzilla.gnome.org/show_bug.cgi?id=710306
LibvirtMachine: Make the 'properties' field public

Creating, fetching, etc. of snapshots is now part of the
LibvirtMachineProperties and to be able to create snapshots from outside
the machine, we need access to its properties.

https://bugzilla.gnome.org/show_bug.cgi?id=710306
PropertiesToolbar: Make the back button public

To do that, rename it from 'back' to 'back_button' to make the name more
desriptive. This will be needed in a later patch to access the
PropertiesToolbar's back_button from within SnapshotsProperty.

https://bugzilla.gnome.org/show_bug.cgi?id=710306
Topbar: Make props_toolbar public

This will be used in a later patch to access the props_toolbar's back
button from SnapshotsProperty.

https://bugzilla.gnome.org/show_bug.cgi?id=710306