Log Message:
-----------
Make relevant changes on the script to handle the installation of trusted and
untrusted PLs in a more distinguished way.

Also mention about new custom GUC variables and copy freshly introduced init.scm
file too.

Modified Files:
--------------
    plscheme:
        install.sh (r1.7 -> r1.8)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plscheme/plscheme/install.sh.diff?r1=1.7&r2=1.8)

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