Heritrix: Internet Archive Web Crawler

This issue is now discussed in the new JIRA tracker at
http://webteam.archive.org/jira/browse/HER-384 -- please add further
comments at that location.

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Fixed.

Below is commit.

* src/java/org/archive/crawler/admin/StatisticsTrackerTest.java
Added test of reverse sort.
* src/java/org/archive/crawler/admin/StatisticsTracker.java
(getSortedByValue): Renamed as
(getReverseSortCopy): Added. Returns TreeMap instead of
TreeSet.
Added handling of case where entrySet is not supported
in the passed map.
(getLongestMapEntryKey): Changed implementation so it
operates on
an iterator of keys rather than an interator of Map.Entry.
(writeHostReport): Changes to go against changed way in
which
getLongest... and getSortedByValue have changed.

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Taking this issue. StatisticsTracker relys on entrySet.
This don't work so well when going against BigMap
implementations that are disk backed.