Merge the latest unordered changes. These are concerned with getting the tests

working on more compilers. The biggest change is that the exception tests have
been changed to use a very simple exception testing mechanism on top of
lightweight_test. This was because Boost.Test exception testing isn't working
on several platforms. I'm trying to set this up so that I can use Boost.Test on
compilers which it completely supports, and lightweight test on others.
Boost.Test tests more than my simple exception testing code ever will so it's
worth using where I can.


[SVN r42698]

test/exception/Jamfile.v2

@@ -5,7 +5,8 @@
 
 import testing ;
 
-alias framework : /boost/test//boost_unit_test_framework ;
+#alias framework : /boost/test//boost_unit_test_framework ;
+alias framework : ;
 
 project unordered-test/exception-tests
     : requirements