Unload/load provision scripts on tests init
Corrected p-Value for the look-elsewhere effect

- Applied Šidák correction when there are more than 2 variations in the split test
- Added tests
Introduce CM_App::getProvisionLoader()
Pass output stream to load, unload, reload - do not store it on instance
Do not pass output to getProvisionLoader
Formatting
Replace CM_App::setup() with getProvisionLoader
Fixed the number of independent experiments used for the Sidak correction

- Clarified wording
- Adjusted tests
Fixed number of independent experiments again

- Fixed typo
- Adjusted tests
escape tracking url in render adapter
Merge pull request #1559 from mariansollmann/issue-1559

Follow up: CM_Mail_WelcomeTest dont use htmlspecialchars in CM_Dom_NodeList
Added docu
Used data provider for readability
Docu
enforce preconditions for CM_MongoDb_ClientTest::testDatabaseExists()
adjust class name
make large buttons smaller, cleanup styles
Merge pull request #1553 from fauvel/issue-1553

Add Šidák correction to the split test significance
Merge pull request #1547 from alexispeter/issue-1547

CM_MongoDb_ClientTest::testDatabaseExists is flaky
Merge pull request #1561 from christopheschwyzer/issue-1561

Decrease large button size