write comprehensive phpDocumentation for all core classes

[mattab]

write comprehensive phpDocumentation for all core classes

[mattab]

(In ³⁹⁵) – fix #5566 Column nb_visits already in the array
thanks to all for your help! :)
- refs #5453 working on this…
- split the Record_\* classes into several files

[mattab]

(In ⁴⁰⁴) – fixed rendering of recursive dataTable (php / xml) eg. try http://piwik.org/demo/index.php?module=API&method=Actions.getActions&idSite=1&period=week&date=today&filter_column_recursive=label&filter_pattern_recursive=index&expanded=1&format=xml
- refs #5453 work in progress

[mattab]

(In ⁴¹⁰) – refs #5453 work in progress soon finished
- updated OFC lib and added link to stats on EVOLUTION GRAPH
- changed api of Piwik_ViewDataTable::factory

[mattab]

(In ⁴¹¹) – refs #5453 work in progress

[mattab]

Left to do:

PluginsFunctions/*
Log
Period
Piwik
Plugin
PluginsManager
Site
TablePartitioning
Timer
Translate
Url
View
and a few other.

[mattab]

we decide to do this regularly when encoutering files that need cleaning.