"IRC Network Unavailable" status of xdcc pack won't be downloaded

[Cabji]

If Hush attempts to download a pack while disconnected from an IRC network, the pack's status is set to "IRC Network Unavailable".

If all of the packs in a downloadHash{searchTerm} are marked as this, Hush will never attempt to download these packs again when the IRC connection comes back.

There needs to be a mechanism that looks for IRC connection and updates the pack statuses and resumes downloading.