Added a few unit tests for TnyFolderStoreQuery

[Philip Van Hoof <spam pvanhoof be>]

Because the rule is that each new feature NEEDS a unit test:

http://svn.tinymail.org/svn/tinymail/trunk/libtinymail-test/tny-folder-store-query-test.c


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Philip Van Hoof, software developer at x-tend 
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