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- Make child process pass back info in stages so we can pinpoint 
  where a segfault occured more closely.
- provide a au_assert_script function to run a script and grab output
  and error code and take input.
x add the scheme unit testing stuff here.
- maybe add a c++ wrapper since no one likes CppUnit.
- configure check for guile interpreter and SLib
- configure chooser for enabling/disabling units.
- add guile-unit documentation to manual