update debian/copyright

Please add the missing licenses of
 bbdb-3.1.1\tex\bbdb-cols.tex
 bbdb-3.1.1\tex\bbdb-print-brief.tex
 bbdb-3.1.1\doc\bbdb.info
 bbdb-3.1.1\doc\bbdb.texi
to debian/copyright and take care of:
 E: bbdb3 source: license-problem-gfdl-invariants doc/bbdb.info
 E: bbdb3 source: license-problem-gfdl-invariants doc/bbdb.texi