Fix to problem with NAIF read with token value of ref to undef: t+

Problem reported by Ruslan Zakirov on marpa-parser Google Group.
Clarify "undefined" for token values, etc.
Cleaning up GNU autoconf configuration: t+
Clean up Config::AutoConf configuration: t+
Cleaning up GNU autoconf configuration: t+
Move Ruslan Z's bug into the test suite
Add test of ref to undef as NAIF token value

Regression test of bug found by Ruslan Zakirov.
Work on forgiving tokens: t+
Work on forgiving tokens: t+
Work on forgiving tokens
Work on forgiving tokens: t+
Added tests for forgiving tokens: t+
Packaging
Bumped version to 2.079_007