python - be: Complete namespace interface addition.

Log Message:
-----------
Complete namespace interface addition.

Forgot the cache global and extern.

Modified Files:
--------------
be/include/pypg:
externs.h (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/include/pypg/externs.h.diff?r1=1.2&r2=1.3)
be/src:
globals.c (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/src/globals.c.diff?r1=1.2&r2=1.3)