Include all tests/*.py files in the MANIFEST so tests won't fail on tarballs.

This fixes failing test-http-proxy and test-webraw.

MANIFEST.in

@@ -1,18 +1,18 b''
 include hg
 recursive-include mercurial *.py
 include hgweb.cgi hgwebdir.cgi
 include hgeditor rewrite-log
-include tests/README tests/coverage.py tests/run-tests.py tests/md5sum.py tests/test-*[a-z0-9] tests/*.out
+include tests/README tests/*.py tests/test-*[a-z0-9] tests/*.out
 prune tests/*.err
 include *.txt
 include templates/map templates/map-*[a-z0-9]
 include templates/*.tmpl
 include templates/static/*
 include doc/README doc/Makefile doc/gendoc.py doc/*.txt doc/*.html doc/*.[0-9]
 recursive-include contrib *
 include README
 include CONTRIBUTORS
 include COPYING
 include Makefile
 include MANIFEST.in
 prune *.elc *.orig *.rej *~ *.o *.so *.pyc *.swp *.prof