pginstaller - pginst: Create user function.

Log Message:
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Create user function. Actual create user part by Dave Page, glue and hackarounds by me.

Also add comment to the database superuser account highlighting that this is not the same as the service account.

Modified Files:
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pginst/ca:
Makefile (r1.5 -> r1.6)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/ca/Makefile.diff?r1=1.5&r2=1.6)
pginstca.c (r1.12 -> r1.13)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/ca/pginstca.c.diff?r1=1.12&r2=1.13)
user.c (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/ca/user.c.diff?r1=1.1&r2=1.2)
pginst/wxs:
dialogs.wxs (r1.12 -> r1.13)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/wxs/dialogs.wxs.diff?r1=1.12&r2=1.13)
pginst.wxs (r1.29 -> r1.30)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/wxs/pginst.wxs.diff?r1=1.29&r2=1.30)

Added Files:
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pginst/ca:
pginstca.h (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/ca/pginstca.h?rev=1.1&content-type=text/x-cvsweb-markup)