Sqlite3 and LevelDB persistent cache plugins + usage from DataSource#197

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Commits on Nov 10, 2016

added very basic persistant cache API

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basic cache performance testing using leveldb

pfederl
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Added persistent cache plugin using Qt's sqlite.

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Commits on Nov 18, 2016

merge develop
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Commits on Nov 20, 2016

Commits on Nov 28, 2016

converted Pavol's LevelDB persistent cache implementation to a plugin
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Commits on Dec 7, 2016

Commits on Jan 19, 2017