delHost doesn't keep in-memory config in sync

[Jehiah]

the code for web/admin/pages.py/DeleteHost does not use web/admin/pages.py/Editor/delHosts like the matching addHost call does. this leads to ugly code, and i think some of it is unused right now

Further, the delHost function that is called does not properly update the config object (the un-called Editor/delHost function does have logic to remove the host from the internal config)

this causes problems if you re-add an existing host under a new name, as it will be listed in the config file twice, and it makes it so the running config file does not match the 'all' interface