plscheme - plscheme: Remove --conn-user parameter and instead introduce

Log Message:
-----------
Remove --conn-user parameter and instead introduce PSQL_OPTS variable. (Also add
some extra information messages about installation query fail and succesful
completion.)

Modified Files:
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plscheme:
install.sh (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plscheme/plscheme/install.sh.diff?r1=1.1&r2=1.2)