1. Advance to cppad-20180000.0.
    2. Distinguish between CppAD and Fedora release.
    3. Remove patches that were part of 2017 bug fixes.
    4. No longer necessary to remove cppad_lib from CMakeLists.txt files.
    5. Add -Wconversion and remove --ansi from cppad_cxx_flags.
    6. Remove ChangeLog and AUTHORS files.