Piwik Upgrade

It is not possible to upgrade an old instance of piwik to the latest version in one step.

I took the following steps:
– 0.9 -> 1.0
– 1.0 -> 2.0
– 2.0 -> 2.14
– 2.14 -> 2.17
– 2.17 -> 3.0

Everytime all files except for config/config.ini need to be deleted.

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