pginstaller - pginst: Fix initdb on win2k: Create a bat file and call

Log Message:
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Fix initdb on win2k: Create a bat file and call it, because win2k can't handle a commandline as complex as the one we had. Also, specify computername instead of "." for local domain because win2k can't deal otherwise.

Also, revert to using LogonUser on XP and newer again - seems the SSPI method doesn't *always* work on XP (it should, but it doesn't).

Modified Files:
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pginst/ca:
pginstca.c (r1.8 -> r1.9)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/ca/pginstca.c.diff?r1=1.8&r2=1.9)