pgsql: Add plperl.on_plperl_init and plperl.on_plperlu_init settings for

Log Message:
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Add plperl.on_plperl_init and plperl.on_plperlu_init settings for language-specific startup. Rename recently added plperl.on_perl_init to plperl.on_init. Also, code cleanup for utf8 hack. Patch from Tim Bunce, reviewed by Alex Hunsaker.

Modified Files:
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pgsql/doc/src/sgml:
plperl.sgml (r2.79 -> r2.80)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/plperl.sgml?r1=2.79&r2=2.80)
pgsql/src/pl/plperl:
GNUmakefile (r1.42 -> r1.43)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plperl/GNUmakefile?r1=1.42&r2=1.43)
plc_safe_ok.pl (r1.3 -> r1.4)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plperl/plc_safe_ok.pl?r1=1.3&r2=1.4)
plperl.c (r1.164 -> r1.165)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plperl/plperl.c?r1=1.164&r2=1.165)
pgsql/src/pl/plperl/expected:
plperl_shared.out (r1.1 -> r1.2)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plperl/expected/plperl_shared.out?r1=1.1&r2=1.2)
plperlu.out (r1.1 -> r1.2)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plperl/expected/plperlu.out?r1=1.1&r2=1.2)
pgsql/src/pl/plperl/sql:
plperl_shared.sql (r1.1 -> r1.2)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plperl/sql/plperl_shared.sql?r1=1.1&r2=1.2)
plperlu.sql (r1.1 -> r1.2)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plperl/sql/plperlu.sql?r1=1.1&r2=1.2)