dbi-link - dbi-link: Removed test directory (replaced with examples

Log Message:
-----------
Removed test directory (replaced with examples directory)

Here's the commit message that should have gone with the previous
commit:

Added functions dbi_link.dbi_quote(in_data_source_id INTEGER, in_text
TEXT) and dbi_link.dbi_quote_identifier(in_data_source_id INTEGER,
in_text TEXT) to expose the DBD-specific versions of these to SQL.

Changed dbi_link.make_dbi_link_role(in_role_name TEXT) to
dbi_link.grant_admin_role(in_role_name TEXT).

Commented out call to CREATE ROLE because it broke the install script
when installing twice in the same cluster. Per Michael Fuhr.

Added dbi_link.grant_user_role(in_role_name TEXT) function.

Added checks in get_tables and get_columns loops for
Oracle/Linux/x86_64 issue.

Removed Files:
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dbi-link/test/csv:
csv.t
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/dbi-link/dbi-link/test/csv/csv.t)
keywords_csv
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/dbi-link/dbi-link/test/csv/keywords_csv)
dbi-link/test/excel:
excel.sql
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/dbi-link/dbi-link/test/excel/excel.sql)
excel.t
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/dbi-link/dbi-link/test/excel/excel.t)
settings.xls
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/dbi-link/dbi-link/test/excel/settings.xls)
dbi-link/test/mysql:
mysql.sql
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/dbi-link/dbi-link/test/mysql/mysql.sql)
mysql.t
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/dbi-link/dbi-link/test/mysql/mysql.t)
sakila-data.sql
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/dbi-link/dbi-link/test/mysql/sakila-data.sql)
sakila-schema.sql
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/dbi-link/dbi-link/test/mysql/sakila-schema.sql)
dbi-link/test/oracle:
oracle.sql
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/dbi-link/dbi-link/test/oracle/oracle.sql)
oracle.t
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/dbi-link/dbi-link/test/oracle/oracle.t)
dbi-link/test/postgresql:
postgresql.sql
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/dbi-link/dbi-link/test/postgresql/postgresql.sql)
postgresql.t
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/dbi-link/dbi-link/test/postgresql/postgresql.t)