Adding support for the Python coverage.py tool.

This assumes that coverage.py has been run in such a way to produce its
standard XML output. This uses the Cobertura schema and should be somewhat
generalizable.

Tests/PythonCoverage/DartConfiguration.tcl.in

@@ -0,0 +1,8 @@
+# This file is configured by CMake automatically as DartConfiguration.tcl
+# If you choose not to use CMake, this file may be hand configured, by
+# filling in the required variables.
+
+
+# Configuration directories and files
+SourceDirectory: ${CMake_BINARY_DIR}/Testing/PythonCoverage/coveragetest
+BuildDirectory: ${CMake_BINARY_DIR}/Testing/PythonCoverage

Tests/PythonCoverage/coverage.xml.in

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+<?xml version="1.0" ?>
+<!DOCTYPE coverage
+  SYSTEM 'http://cobertura.sourceforge.net/xml/coverage-03.dtd'>
+<coverage branch-rate="0" line-rate="0.8462" timestamp="1380469411433" version="3.6">
+	<!-- Generated by coverage.py: http://nedbatchelder.com/code/coverage -->
+	<packages>
+		<package branch-rate="0" complexity="0" line-rate="0.8462" name="">
+			<classes>
+				<class branch-rate="0" complexity="0" filename="foo.py" line-rate="0.6667" name="foo">
+					<methods/>
+					<lines>
+						<line hits="1" number="2"/>
+						<line hits="1" number="3"/>
+						<line hits="1" number="4"/>
+						<line hits="1" number="6"/>
+						<line hits="0" number="7"/>
+						<line hits="0" number="8"/>
+					</lines>
+				</class>
+				<class branch-rate="0" complexity="0" filename="test_foo.py" line-rate="1" name="test_foo">
+					<methods/>
+					<lines>
+						<line hits="1" number="2"/>
+						<line hits="1" number="3"/>
+						<line hits="1" number="5"/>
+						<line hits="1" number="7"/>
+						<line hits="1" number="8"/>
+						<line hits="1" number="10"/>
+						<line hits="1" number="11"/>
+					</lines>
+				</class>
+			</classes>
+		</package>
+	</packages>
+</coverage>

Tests/PythonCoverage/coveragetest/foo.py

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+
+def foo():
+    x = 3 + 3
+    return x
+
+def bar():
+    y = 2 + 2
+    return y

Tests/PythonCoverage/coveragetest/test_foo.py

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+
+import foo
+import unittest
+
+class TestFoo(unittest.TestCase):
+
+    def testFoo(self):
+        self.assertEquals(foo.foo(), 6, 'foo() == 6')
+
+if __name__ == '__main__':
+    unittest.main()