* _charts_series_values() moved from charts.inc to charts.module

Misc:
* charts_chart() dont need the chart plugin as the first argument, since it will be given using the $chart array or thru settings

* Now settings options about series are loaded. So its possible to set default color for series.

* charts_chart() function now works fine

* implementation of hook_requirements() to alert users that he/she didnt installed any chart provider module

* hook_menu() implementation, creating a settings page and a testing environment
* charts_chart() function will be the contact point to all external modules to create a chart from a data

Misc:
* File $Id: $ correctly placed

* A small warning about the charts_api.txt file

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