referer URLs with host registered as main_url or alias_url should NOT be counted as referer

[mattab]

referer URLs with host registered as main_url or alias_url should NOT be counted as referer

[mattab]

Problem: it requires a lookup of alias URLs for each request, which is too expensive. This has to be done at the Archiving process.

[mattab]

(In ⁹⁹⁴) – fixed #9 referer URLs with host registered as main_url or alias_url should NOT be counted as referer
now if a visitor comes to piwik.org/ with a piwik.org/xx/y/z referer, it will be considered a direct entry rather than a referer visit.
makes use of the new caching mechanism introduced with the Goal Tracking plugin, to cache website-related data for super fast access at Tracker time.
- Goals is not a tracker plugin anymore (improving performance of Tracker)
- fixed bug that the cache file wasn’t read properly and goal queries were done at each piwik.php request

[mattab]

(In ⁹⁹⁷) -refs #5429 now removes www. before testing for more accuracy

[mattab]

reopening because the UI doesn't specify what the alias URLs are for. The UI should explain:

It is recommended, but not required, to specify the various URLs that your visitors use to access this website. 
Alias URLs for a website will not appear in the Referers > Websites report. 
Note that it is not necessary to specify the URLs with and without 'www' as Piwik automatically considers both.

is this inline help clear?

[robocoder]

Sounds good. We should add this to both the installer and site manager.

[robocoder]

In [1626], fixes #5429 - add inline help re: alias urls to SitesManager "add site"

Defering any change the Installation screen because the textarea isn't styled consistently.