[TiddlyWebWiki] safe deletion

[FND]

Regular users should not be able to delete shared tiddlers.

Therefore the default bags (system and common) should be assigned a policy preventing this.

[FND]

This could be achieved using toolbar commands' isEnabled method and the server.permissions field:

config.commands.deleteTiddler.isEnabled = function(tiddler) {
	return tiddler.fields["server.permissions"]
		.split(", ").contains("delete");
};

[FND]

Fixed in changeset:9972 ("disabled save and delete toolbar commands for unauthorized users").

A new ticket (#1100) has been created for trash can functionality.

[FND]

On reflection, while useful, this fix does not solve the original issue. Adjusting the ticket description accordingly.

[FND]

 http://github.com/tiddlyweb/tiddlywebwiki/commit/f057151a7ec9c57f615132427105f5fe65c31a38 adds policies to default bags preventing (among other things) deletion by regular users.

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