[Bugs] #2324 UNSP: add copy toolbar to abacus

[Sugar Labs Bugs]

#2324: add copy toolbar to abacus
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    Reporter:  walter                     |          Owner:  walter                     
        Type:  enhancement                |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Abacus                     |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:  sugar-love                 
Status_field:  Unconfirmed                |   Distribution:  Unspecified                
   Seeta_dev:  Shanjit                    |  
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Comment(by walter):

 > So you will be able, for example, to convert a decimal number to a
 binary representation?

 Yes. In the version currently in git, you can type numbers (on the bar
 where the results are displayed) and whatever abacus you are using will
 display those results.

 > What about not zeroing the abacus when you change scales as an easy
 alternative for these conversions?

 Do you have the abacus start with the value of whatever abacus you had
 previously been using?

 > What about pasting fractions into integer abacuses? What when a number
 has 2 different representations on the one abacus?

 At present, if you type in a fraction on an integer abacus, you only get
 the whole number part. If you type a number too large to fit on an abacus,
 you get a somewhat random result. (I need to do some bounds checking.)

 The most "efficient" representation is used when more than one is
 available (i.e., maximizing the use of top beads and beads towards the
 left).

 There is currently a "bug" regarding inputing some fractions: for example,
 inputing 1/3 will not result in a 1/3 bead being selected, since
 internally I make a decimal approximation. I need to think about the best
 way to handle this.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2324#comment:6>
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