THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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null: no upgrade required (if a new application is started or upgrade was done already)"0.10.0.x","0.10.1.x","0.10.2.x","0.11.0.x","1.0.x", and"1.1.x": for upgrading from 0.10.0.x,..., 1.1.x to 1.2
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null: for no upgrade required"0.10.0.x": for upgrading from 0.10.0.x to any version of 0.10.1.x, ..., 1.1.x
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