[Bugs] #4729 Sugar NORM: convert to new style gobject signal format

[Sugar Labs Bugs]

#4729: convert to new style gobject signal format
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  Reporter:  walter       |            Owner:
      Type:  task         |           Status:  new
  Priority:  Normal       |        Milestone:  Unspecified
 Component:  Sugar        |          Version:  Unspecified
  Severity:  Unspecified  |       Resolution:
  Keywords:               |  Distribution/OS:  Unspecified
Bug Status:  Unconfirmed  |
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Changes (by SAMdroid):

 * cc: godiard, tch (added)

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Comment:

 What pyGObject version does this require?

 It looks cool though!

 Even better, if you use the new way to define signals, you can still use
 the old way to `.connect` to the signal.
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Ticket URL: <http://bugs.sugarlabs.org/ticket/4729#comment:2>
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