newsysviews - newsysview: add views and view_columns views.

Log Message:
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add views and view_columns views. Refactor column views into a common
relation_columns view set which both table_columns and view_columns use.
(Clients will need relation_columns too, since they should not need to
distinguish tables and views in most cases, so that is part of the public
interface)

Modified Files:
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newsysview/sql:
build.sh (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/newsysviews/newsysview/sql/build.sh.diff?r1=1.1&r2=1.2)
index_columns.sql (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/newsysviews/newsysview/sql/index_columns.sql.diff?r1=1.1&r2=1.2)
table_columns.sql (r1.3 -> r1.4)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/newsysviews/newsysview/sql/table_columns.sql.diff?r1=1.3&r2=1.4)

Added Files:
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newsysview/sql:
relation_columns.sql (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/newsysviews/newsysview/sql/relation_columns.sql?rev=1.1&content-type=text/x-cvsweb-markup)
view_columns.sql (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/newsysviews/newsysview/sql/view_columns.sql?rev=1.1&content-type=text/x-cvsweb-markup)
views.sql (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/newsysviews/newsysview/sql/views.sql?rev=1.1&content-type=text/x-cvsweb-markup)