Fixing some tests, make sure processed metrics are computed even if generic filters disabled, and do not apply queued filters in datatablemanipulators when fetching subtables.

Piwik is a free/libre analytics platform. Refs #4455 GNU Package requirement to use free/libre instead of open source

refs #4872 this should fix getPageUrl returns same results for several day when a range is used. Waiting to see which tests fail. In this case date always equaled to "2014-03-11,2014-03-18" for each subtable/day

Fixes #4768 Implement performance improvement for period=range: do not archive sub-tables (only the parent table).
The sub-tables will be archived only when idSubtable is found, or flat=1, or expanded=1

fixes #4609

Refs #4200, documented many more filters and modified ColumnCallbackDeleteRow so filter supplied returns true if the row should be deleted (as opposed to the other way around).

Refs #4200, make DataTable:: private & add public methods necessary, tweaking some filter docs, and remove AddConstantMetadata filter.

PHP Tracker and Tests fixtures
Schema updates

(some tests failing)

This allows the IDE to pick up all code!

refs #4113

Refs #4041, added  parameter to Archive::getDataTableExpanded so entire tree will not be created if not necessary.

Added namespaces to functions.php files in the five plugins that had one
Work in progress

renaming Unzip to Uncompress,
Renaming Tracker/Referer to Tracker/Referrer,
and few more

Refs #4059 Work in progress: Conversion to use Namespaces: Period*, Metrics, Segment, SegmentExpression, PluginsManager.
Removed some deprecated code.