Merge remote-tracking branch 'origin/master'
minor
up code version to 90
make SORT_SHAPE the default
bugfix in SolverActivity - do not restore scramble state of an object there!
bump to version 2.0.1
improve the object popup in Config Activity.
bugfix for a crash.
progress with shape icons.
progress
bugfix
Catch the error when WebView is not installed.
progress with new sorting methods.
Progress with sorting the objects by various criteria.
test of push from Windows2
test of push from Windows
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