create slug per category

[Franky]

function eme_event_category_url() should use a category slug too, since later on the function eme_get_category_ids() uses a category name that can be “permalink converted”, but in a db the names are of course not converted and so some categories might not match.
So: introduce a slug per category too (as for events and locations).

[Franky]

implemented in trunk: http://plugins.trac.wordpress.org/changeset/1033472

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