New joyride build 1793

[Build Announcer v2]

http://xs-dev.laptop.org/~cscott/olpc/streams/joyride/build1793

Changes in build 1793 from build: 1790

Size delta: 0.14M

-Calculate 17
+Calculate 19
-Read 44
+Read 45

--- Changes for Calculate 19 from 17 ---
  + Include Gary Martin's icons
  + Power operator for Rationals
  + Fix Decimal operator issues, #6478

--- Changes for Read 45 from 44 ---
  + Save document to DS after download
  + Don't suspend when shared

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