remove cover and xmlresult plugins as they are not easily installable

and lead to frustration (thanks again to prologic for getting back on it)

--HG--
branch : trunk

doc/test/plugin/index.txt

@@ -10,8 +10,6 @@ pdb_ interactive debugging with the Python Debugger.
 
 figleaf_ (external) report test coverage using the 'figleaf' package.
 
-coverage_ (external) for testing with Ned's coverage module 
-
 monkeypatch_ safely patch object attributes, dicts and environment variables.
 
 capture_ configurable per-test stdout/stderr capturing mechanisms.

doc/test/plugin/links.txt

@@ -35,7 +35,6 @@
 .. _`recwarn`: recwarn.html
 .. _`pytest_pdb.py`: http://bitbucket.org/hpk42/py-trunk/raw/1.2.1/py/_plugin/pytest_pdb.py
 .. _`monkeypatch`: monkeypatch.html
-.. _`coverage`: coverage.html
 .. _`resultlog`: resultlog.html
 .. _`pytest_junitxml.py`: http://bitbucket.org/hpk42/py-trunk/raw/1.2.1/py/_plugin/pytest_junitxml.py
 .. _`django`: django.html