(Clone Detection) Documentation
(Support) Bug fix for libpqxx using _GLIBCXX_DEBUG
(Clone Detection) syntactic clone detection changes

* Some of the executables were changed to use ROSE's SqlDatabase
  facility instead of sqlite3x.

* The syntactic clone schema is in Schema.sql and created by the
  new createSchema tool.  A few minor changes were made to table and
  column names.

* Reindented code that was modified.