Log Message:
-----------
Fix plperl's elog() function to convert elog(ERROR) into Perl croak(),
rather than longjmp'ing clear out of Perl and thereby leaving Perl in
a broken state. Also some minor prettification of error messages.
Still need to do something with spi_exec_query() error handling.

Modified Files:
--------------
pgsql/src/pl/plperl:
SPI.xs (r1.9 -> r1.10)
(http://developer.postgresql.org/cvsw...r1=1.9&r2=1.10)
plperl.c (r1.58 -> r1.59)
(http://developer.postgresql.org/cvsw...1=1.58&r2=1.59)

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