[Bugs] #2541 UNSP: Read can't save a PDF with a form

[Sugar Labs Bugs]

#2541: Read can't save a PDF with a form
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    Reporter:  godiard                    |          Owner:  godiard                    
        Type:  defect                     |         Status:  assigned                   
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Read                       |        Version:  Git as of bugdate          
    Severity:  Unspecified                |       Keywords:                             
Status_field:  New                        |   Distribution:                             
   Seeta_dev:                             |  
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Comment(by sascha_silbe):

 I just discovered that Okular (the PDF viewer shipped with KDE) is able to
 save a filled-in PDF form that can be modified again. So it seems there is
 some way to do that in the PDF format; my original analysis was incorrect.
 Even better, evince apparently already supports it
 ([https://bugzilla.gnome.org/show_bug.cgi?id=480668|Gnome#480668]. Just
 checked with evince 2.30.3-2 (Debian Squeeze) and using "Save a copy"
 indeed saves the filled-out form values, too! (when it doesn't segfault,
 that is :-/ )

 We probably only need to use the {{{evince.Document.save()}}} function
 instead of the hard linking trick in
 {{{readactivity.ReadActivity.write_file()}}}.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2541#comment:2>
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