Add mimetype for Smart Notebook files and icons to pix

Some of our teachers use Smart Notebook files in Moodle with interactive whiteboards. It is helpful to have these in filelib.php and pix/f so that they can be downloaded and displayed with all the other files in the course.

I have the below added to /lib/filelib.php under the function get_mimetypes_array()

'gallery'	=> array ('type'=>'application/x-smarttech-notebook', 'icon'=>'notebook'),

'galleryite'	=> array ('type'=>'application/x-smarttech-notebook', 'icon'=>'notebook'),

'gallerycollection'	=> array ('type'=>'application/x-smarttech-notebook', 'icon'=>'notebook'),

'notebook'	=> array ('type'=>'application/x-smarttech-notebook', 'icon'=>'notebook'),

'nbk'	=> array ('type'=>'application/x-smarttech-notebook', 'icon'=>'notebook'),

I also have the different pix/f/ images but will try to upload them separately.

This will save me (any maybe others) from having to manually add these after each upgrade.

Thanks
Alex