chgserver: add [alias] to confighash The [alias] config section affects a global state: commands.table. It's hard to trace whether an alias is added by a config option or an extension, and add/remove aliases in a safe way per chg request. It will hurt performance a bit if we clean the table and parse aliases every time. Therefore let's just add it to confighash. This will make chg pass test-pager.t.