refs #6635 move php server config from phpunit.xml to config which seems to simplify quite a lot.
refs #6635 if user has not configured test section but Piwik is installed then we can configure most parts for the user
refs #6635 updated instructions
#6635 rename phpunit.xml to phpunit.xml.dist. did not know it is supported out of the box by phpunit
refs #6635 mention phpunit.xml no longer needed in changelog
refs #6635 match absolute path
Merge pull request #6645 from piwik/6635

Easier configuration to run tests