WcolEpre.XXX    - generation E, prerelease

``WcolE'' is fifth generation of Wcol.
WcolE is multi-threaded, and multi-process prefetching proxy server.
The multi-thread is made asyncrnous (non-blocking) connections.
The multi-process is made pre-fork technique.

What is change in WcolE from WcolD ?
    Something.  Don't worry, most of changes are inherited from WcolC, these is
    not brend new.  Some points is changed from WcolD above:

        - Multi-threading via asyncronus (non-blocking) connection

        - ICP communication among other siblings
            * Query other proxies
            * Reply hit/miss to other proxies
            * Notify other proxies

New configuratin argument 'FetchParent', 'PrefetchParent' and 'ImportSibling'.
FetchParent replaced with NextProxy of Wcol-D.  ImportSibling replaced with
ImportProxy of Wcol-D.

Thanks:
	LOVRIC Ivan - he reported bug arround 'lastfd' (1998 July).
	Shigeyuki FUKUSHIMA - he reported errno arround async. connection on
		FreeBSD 2.2.6 (1998 July)