Fix packjt truncation error and text3 null detection.
Add additional test messages.
Add check message capability to jt65code and jt9code so that
comparison confirms expected output.
jt65code and jt9code now should always have identical outputs..should
allow for automatic regression testing.
Thanks to Mike, W9MDB, for this contribution.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7649 ab8295b8-cf94-4d9e-aec4-7959e3be5d79