[RCD] First patch for filters !

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Hi !

Here is my first patch for my filter's system.

I separate my filter system (named mc_filters) from the filter's interface.

In lib/Filters are the different classes for filter's system (for the moment only mc_filters and the base class).Filter's system used are stored in the main.inc.php.

So.. I'm open to all your remarks, like horribles English's mistakes ;).

The code is a bit ugly for the moment (I try to not edit your base files and the CSS so I re-use for ex. the classes for another pages for settings) ^^, but I will correct this later.

All is based on the revision 740 of the trunk.

What do you think about it ? What I have to change ?

Regards,