Use absolute imports on all plugins

This is necessary because Gajim is with 0.16.11 a python package

image/image.py

@@ -7,10 +7,10 @@ import os
 import base64
 import urllib
 
-import chat_control
-from plugins import GajimPlugin
-from plugins.helpers import log_calls
-from dialogs import ImageChooserDialog, ErrorDialog
+from gajim import chat_control
+from gajim.plugins import GajimPlugin
+from gajim.plugins.helpers import log_calls
+from gajim.dialogs import ImageChooserDialog, ErrorDialog
 
 NS_XHTML_IM = 'http://jabber.org/protocol/xhtml-im'             # XEP-0071
 

image/manifest.ini

@@ -1,10 +1,10 @@
 [info]
 name: Image
 short_name: image
-version: 0.5.1
+version: 0.5.2
 description: This plugin is designed to send a small(0 - 40 kb) graphic image to your contact.
  Client on the other side must support XEP-0071: XHTML-IM and maintain the scheme data: URI.
  Psi+ and Jabbim supported this.
 authors: Denis Fomin <fominde@gmail.com>
 homepage: http://trac-plugins.gajim.org/wiki/ImagePlugin
-min_gajim_version: 0.16.10
+min_gajim_version: 0.16.11