veil - veil: Fixes for properly handling nulls in veil interface

Log Message:
-----------
Fixes for properly handling nulls in veil interface functions.

Modified Files:
--------------
veil/docs:
Doxyfile (r1.12 -> r1.13)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/veil/veil/docs/Doxyfile.diff?r1=1.12&r2=1.13)
veil/src:
veil_interface.c (r1.9 -> r1.10)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/veil/veil/src/veil_interface.c.diff?r1=1.9&r2=1.10)
veil_interface.sqs (r1.5 -> r1.6)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/veil/veil/src/veil_interface.sqs.diff?r1=1.5&r2=1.6)
veil_serialise.c (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/veil/veil/src/veil_serialise.c.diff?r1=1.1&r2=1.2)