Attached is a patch that makes Fetcher.java work better with plugin system.

Changes are
(1) critical regions added in
src/java/net/nutch/plugin/Extension.java
src/java/net/nutch/plugin/PluginRepository.java
by Stefan

(2) make PluginRepository.finalize() public

(3) Explicitly invoke shutDown() for all possible plugins in Fetcher.java

(4) Better monitoring of FetcherThreads, trying to solve
one type of process hang problem (due to unfinished non FetcherThread
thread).

If looks okay, I will commit in two days.

John


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