Fixes #2268 Refs #5099

Fixes  #5123 PHP Tracker, added new method setForceNewVisit() to force creation of a new visit + with test

Close https://github.com/piwik/piwik/pull/218

[automatic translation update] Updated 70 strings in 38 languages (ar, be, bg, ca, cs, da, de, el, en, es, et, eu, fa, fi, fr, hi, hu, id, it, ja, ka, ko, lt, lv, nb, nl, nn, pl, pt, ru, sq, sr, sv, ta, th, tr, uk, vi)

using phpstorm optimize imports feature

using phpstorm optimize imports feature

Close PR#243

hack to fix pie chart size on retina Fixes #4594 
Kuddos @wedgeV

refs #4706 while having a look on this issue I noticed another issue with this method. There were codepaths that were never reached. For instance if columnToSumValue is a string the check for being false as well cannot work

refs #4987 Simplify Piwik interface: Zen Mode

Prevent stderr from commandExists
nice trick, cheers