[Trac #1251] Include improved calculator

[Zarro Boogs per Child]

#1251: Include improved calculator
---------------------------+------------------------------------------------
 Reporter:  rwh            |        Owner:  J5     
     Type:  enhancement    |       Status:  new    
 Priority:  normal         |    Milestone:  Trial-2
Component:  new component  |   Resolution:         
 Keywords:                 |  
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Comment (by rwh):

 Replying to [comment:11 cjb]:
 > In Calc's favor:
 >  * has very complete scientific/financial modes, hidden from the user
 until the "Mode" button is clicked
 >  * now uses color, is attractive
 >  * return always binds to "equals", which is good.  In Calculadora it
 binds to whatever the last button you clicked was, which I think is a bug
 -- if I click "ac", then do a sum on the keyboard and hit return, the
 answer is briefly shown before my press of the return key activates the
 "ac" again and the result returns to 0.

 Updated version:
  * split clear button in CE/AC. 'Delete' binds to AC
  * Changed multiply label to 'x', both '*' and 'x' bind to it
  * Mode switching keeps buttons in same place. I think the mode button is
 not confusing btw: it's the only other red button available.
  * Bug fixed I think. If you can reproduce it, please let me know
  * XO: http://qhall.seas.harvard.edu/~rwh/olpc/Calc_2007_04_06.xo
 (698780f4ae21de39f03ab0162bc49e3a)
  * Source: http://qhall.seas.harvard.edu/~rwh/olpc/calc_2007_04_06.tgz
 (cc72a7a94340aed0ab694cbb9bfcb739)

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Ticket URL: <http://dev.laptop.org/ticket/1251#comment:15>
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