follow yams api change: attributes permissions are now defined for an 'update' action, no more 'add' / 'delete' which makes no sense in such case. fix afs.relations_by_section permissions checking of object relation on the way.

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function set_tab(tabname, cookiename) {

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    // set appropriate cookie

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    asyncRemoteExec('set_cookie', cookiename, tabname);

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    // trigger show + tabname event

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    trigger_load(tabname);

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}