DefaultContainer is like a mini-IoC container for DWR.
At least it is an IoC container by interface (check: no params that have
anything to do with DWR), but it is hard coded specifically for DWR.
The default implementation of PageNormalizer attempts to read from
WEB-INF/web.xml to find a welcome-files element,
and uses a default of removing "index.html" and
"index.jsp" if this procedure fails.
Where cT is the connectedTime and dT is the disconnectedTime.
We impose some limits: a maximum number of symultaneously connected
browsers maxWaitingThreads, and the maximum number of
connections per second maxHitsPerSecond.
We attempt to keep the actual waitingThreads and hitsPerSecond within
bounds by vairying connectedTime and disconnectedTime.
The system is in one of 3 modes: USAGE_LOW, USAGE_HIGH and USAGE_DIGG.