fix up install docs and plugin docs for the final release

have CHANGELOG be a file containing links instead of a symlink
beause it causes issues with pip-install on some systems.

--HG--
branch : trunk

doc/test/plugin/xmlresult.txt

@@ -1,6 +1,9 @@
-pytest_coverage plugin (EXTERNAL)
+pytest_xmlresult plugin (EXTERNAL)
 ==========================================
 
-This plugin allows to use Ned's coverage package, see
+This plugin allows to write results in an XML format
+compatible to CruiseControl_, see here for download:
 
     http://github.com/rozza/py.test-plugins
+
+.. _CruiseControl: http://cruisecontrol.sourceforge.net/