Simplify ViewDataTable_HtmlTable and move main template to new HtmlTable visualization.
Update README.md

Added a step to ensure the `[database_tests]` section in `piwik/config/config.php.ini` is set up correctly.
Refs #4041, modify tag cloud ViewDataTable to use _dataTable.twig w/ Visualization_Cloud as visualization..
Refs #4041, merge _dataTableGraph.twig with _dataTable.twig (moved unmergable parts to new visualization twig file for Visualization_JqplotGraph).
Refs #4040, Modify getReportDisplayProperties to add display properties for all of a plugin's reports to a list rather than to pick out the display properties for a single report.
Refs #4040, converted CustomVariables plugin to use display properties instead of manually calling ViewDataTable functions.
Refs #4040, converted DBStats plugin to use display properties instead of ViewDataTable methods.
Refs #4040, convert DevicesDetection plugin to use display properties instead of ViewDataTable methods.
Refs #4040, move Piwik_ViewDataTable::getRawSegmentFromRequest to Piwik_API_Request.
Refs #4040, converted Live plugin to use display properties instead of ViewDataTable methods.
Refs #4040, convert Provider plugin to use display properties instead of ViewDataTable methods.
Refs #4040, converted Referrers plugin to use display properties instead of ViewDataTable methods.
small fix
language update refs #3430
Merge pull request #93 from piwik/translationupdates

automatic translation update
Refs #4040, converted UserCountry plugin to use display properties instead of ViewDataTable methods.
Refs #4040, converted VisitorInterest plugin to use display properties instead of ViewDataTable methods.
Merge pull request #92 from ham1/patch-1

Update tests/README.md to include information about setting the DB password for the tests