[Bugs] #3752 Read UNSP: Add page-based viewing functionality

[Sugar Labs Bugs]

#3752: Add page-based viewing functionality
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    Reporter:  dsd                        |          Owner:  godiard                    
        Type:  enhancement                |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Read                       |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 When dealing with "real" book-like PDF files, reading in the Read activity
 is somewhat uncomfortable.

 Read opens with the zoom level defaulting to the width of the page, so the
 first page (the front cover) is shown truncated - the bottom section is
 not shown.

 In the zoom toolbar, there is no option to zoom based on the height of the
 page like there is for width, so I have to click "zoom out" a few times
 until I can see the whole page (and an uncomfortable sliver of the next
 one).

 When I want to change page, I have to scroll - there's nothing equivalent
 to a "page turn" functionality. When the book is logically laid out in
 terms of pages, this is uncomfortable. For example, where an image or a
 diagram fills a page, you aren't going to want to see it cut in half.
 Also, it is hard to make the top of the page you are turning to align with
 the top of the activity.

 Having a more page-based approach (perhaps only as an option activated by
 a toolbar option) would lead to a much more pleasant book reading
 experience here.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3752>
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