Implementing Site Search tracking & reporting in Piwik core!

 * New Admin UI to customize, for each site, wheter site search is enabled. Also options to set default values to use.
 * New Reports: Searches, Searches with no result, Search categories, Top Pages Following a Search
 * to track "No result keyword" users will have to tag their site with a JS call, or add a new parameter to the search result page &search_count=X (X being zero for no result searches)
 * Reports works with Row evolution, PDF/HTML reports, Piwik Mobile
 * idaction_url is now NULLable because, Site Search records a page with idaction_name == Keyword, and idaction_url == NULL. This ensures that the Site Searches don't create "Page URL Not defined" records. 
 * updates to Tracker JS API, new function trackSiteSearch, also added in PHP tracker
 * New fields in log_visit to track searches
 * new segment, "searches" which can be used to select visitors who did a search ie. searches>0 or those who searched a lot, ie searches>10
 
 TODO: 
  * commmit integration test, TESTING, DOCS, FAQ, release, and a nice Prayer to the universe and the stars, hoping that I can code a major new feature without any bug...
  * It would be awesome to have compatiblity with Transitions so we can see, for a given site search, what are the starting pages and Destination pages
  
 Thank you for your patience Timo, 
 and thank in advance everyone for your help Testing this new feature!
 


git-svn-id: http://dev.piwik.org/svn/trunk@7190 59fd770c-687e-43c8-a1e3-f5a4ff64c105

 * Fixing encoding bugs. We never noticed but there was a bug in the code (see change in XML files which are now correct).
 * Display Between X and Y even when values are the same (otherwise it looks like there's a bug)
 * fixing other tests
I'm SO glad we have nice tests coverage for this complicated code otherwise we would be totally screwed!



git-svn-id: http://dev.piwik.org/svn/trunk@7064 59fd770c-687e-43c8-a1e3-f5a4ff64c105

 * plot multiple metrics using $columns (renamed from $column)
 * plot row evolutions using optional $labels, will plot top 5 labels when omitted
 * imageGraphEvolutionUrl added to report metadata (only for reports without constant row count and Referers.getRefererType)
 * $showMetricTitle renamed to $showLegend

refs #3014
 * new report parameter 'Show Historical Graphs for the top 5 values'
 * better looking evolution graph on landcape pages

refs #3158
 * $label is now optional, will return top N=filter_limit row evolutions sorted with filter_sort_column when omitted
 * support for $idGoal
 * integration tests updated

constantRowsCount set on
 * Goals_getDaysToConversion
 * Goals_getVisitsUntilConversion
 * Referers_getRefererType

merges
 * r6874

IDEA
 * in Piwik UI, add a link 'display top 10 row evolutions' using API.getRowEvolution &label=false&filter_sort_column=xyz&filter_limit=10
 
TODO
 * fix scheduled report integration tests
 * review @reviews

git-svn-id: http://dev.piwik.org/svn/trunk@6918 59fd770c-687e-43c8-a1e3-f5a4ff64c105

while setup (atm bulk tracking doesn't work)


git-svn-id: http://dev.piwik.org/svn/trunk@6645 59fd770c-687e-43c8-a1e3-f5a4ff64c105

refs #3227 refactored integration tests to setup database and tracking only once per class; that should speed up the tests a bit

git-svn-id: http://dev.piwik.org/svn/trunk@6626 59fd770c-687e-43c8-a1e3-f5a4ff64c105

git-svn-id: http://dev.piwik.org/svn/trunk@6590 59fd770c-687e-43c8-a1e3-f5a4ff64c105