[JENKINS-13202] 646154f1 refinement: resolveSymlink is documented to return null, not throw an exception, when called on a regular file.

Converting to JUnit 4 thus fixing [JENKINS-14641] and also fixing test(Html)Escape which didn't ran previously because of wrong case

and instead add (char) cast so original test uses right length for name.


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if "ln failed: 78" is logged, try again with shorter name.


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class initialization of Hudson is much more work than that of Util, so pushing these small utilities out to Util to reduce the overhead of remoting.

Plus it helps to keep Hudson.java smaller

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on locales with comma as fraction separator.  Now passing time value to localizer
as float instead of String.


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    (<a href="http://www.nabble.com/Unit-tests-duration-in-milliseconds-tt21417767.html">report</a>)


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filenames with spaces.
- Added new Util.rawEncode which encodes the right set of characters (based on
  RFC1738) and deprecated Util.encode which only encodes non-ASCII.  Unit test too.
- Change previous fix to use Util.rawEncode instead of URLEncoder.encode
- New fix: add h.xmlEscape call for each displayed filename in artifacts/workspace
  so & and < are encoded for HTML display
- Add all these fixes in Run/artifacts-index.jelly which wasn't included before


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Fix for ISSUE#1160 (make duration descriptions more accurate).  The rules for the descriptions are as outlined in this thread: http://www.nabble.com/More-precise-time-strings-tt14781235.html


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