/create_action
action for creating a custom skin

Sourcecode in SkinMgr/actions.js:
1:   function create_action() {
2:      if (req.data.cancel)
3:         res.redirect(this.href());
4:      else if (req.data.save) {
5:         try {
6:            var result = this.evalCustomSkin(req.data, session.user);
7:            res.message = result.toString();
8:            if (!result.error)
9:               res.redirect(this.href("edit") + "?key=" + req.data.prototype + "." + req.data.name);
10:        } catch (err) {
11:           res.message = err.toString();
12:        }
13:     }
14:  
15:     res.data.action = this.href(req.action);
16:     res.data.title = getMessage("SkinMgr.createCustomTitle", {layoutTitle: this._parent.title});
17:     res.data.body = this.renderSkinAsString("new");
18:     res.handlers.context.renderSkin("page");
19:     return;
20:  }