CppUnit - C++ port of JUnit Code

* include/cppunit/TestFailure.h : fixed some constness issues. Added
argument to indicate the type of failure to constructor. Added
isError().

* include/cppunit/TestListener.h : removed addError(). addFailure()
now take a TestFailure as argument.

* include/cppunit/TestResult.h :
* include/cppunit/TestResult.cpp : removed errors(). Refactored. Fixed
some constness issues. Added typedef TestFailures for vector returned
by failures(). failures() returns a const reference on the list of
failure. added testFailuresTotal(). Constructor can take an optional
synchronization object.

* include/cppunit/TextTestResult.h :
* include/cppunit/TextTestResult.cpp : removed printErrors().
Refactored. Updated to suit new TestResult, errors and failures are
reported in the same list.

* examples/cppunittest/TestFailureTest.cpp :
* examples/cppunittest/TestFailureTest.h : modified to use the new
TestFailure constructor. Added one test.

* examples/cppunittest/TestListenerTest.cpp: removed addError().
Refactored to suit new TestListener.

* examples/cppunittest/TestResultTest.h :
* examples/cppunittest/TestResultTest.cpp : modified to suit the
new TestResult.