pginstaller - pginst: Hide the pgperm and initdb windows when running

Log Message:
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Hide the pgperm and initdb windows when running the processes.

Note - initdb can't be hidden on windows 2003 or XP <= SP2. This is a bug in windows documented in Q818858. Works fine
in2000. pgperm.bat is always hidden. 

Modified Files:
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    pginst/ca:
        pginstca.c (r1.53 -> r1.54)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/ca/pginstca.c.diff?r1=1.53&r2=1.54)
    pginst/inst:
        pgperm.bat (r1.3 -> r1.4)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/inst/pgperm.bat.diff?r1=1.3&r2=1.4)