Refactored some of the stickier bits in
ut-cppunit-setup-new-test-suite. Created ut-add-makefile.am-subdir that
adds entries SUBDIR values into a Makefile.am using native lisp rather
than a sed command passed to a shell. Created ut-add-ac-config-files
that adds AC_CONFIG_FILES to a configure.ac file using native lisp
rather than a sed command passed to a shell (which didn't really
work). Testing functions for both.