pginstaller - pginst: Add a target for building a ZIP file with debug

Log Message:
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Add a target for building a ZIP file with debug symbols in it.

Add a subdirectory with code for custom build tasks. For now, add just a zip task to it, for said target. In the
future,expect to migrate some of the ugliest vbscript stuff in there. 

Modified Files:
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    pginst:
        pginst.proj (r1.3 -> r1.4)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/pginst.proj.diff?r1=1.3&r2=1.4)

Added Files:
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    pginst/util/tasks:
        README.txt (r1.1)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/util/tasks/README.txt?rev=1.1&content-type=text/x-cvsweb-markup)
        tasks.proj (r1.1)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/util/tasks/tasks.proj?rev=1.1&content-type=text/x-cvsweb-markup)
        zip.cs (r1.1)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/util/tasks/zip.cs?rev=1.1&content-type=text/x-cvsweb-markup)