This commit was manufactured by cvs2svn to create branch
'compiler_supported_error_messages'.
errors.hpp:
  - Check use of Boost.Function and emit reasonable error messages

function.hpp:
function_template.hpp:
  - Updated to use compiler-supported error messages
bad_error_eg.cpp:
  - Example of error messages with and without compiler help
Added type_with_alignment class template to return a type with the given alignment,
with documentation and testcases.
Boost.Log merged to trunk.